Communist Party of Germany in the context of Klaus Fuchs

Federal elections were held in Germany on 19 January 1919 to elect a national constituent assembly that would write a new constitution for Germany following the collapse of the German Empire at the end of World War I. The election, which took place amid the sometimes violent political upheaval of the German revolution, used a form of proportional representation, lowered the voting age to 20 and allowed women to vote for the first time.

With the exception of the Social Democratic Party (SPD) and the Centre Party (which ran under the name 'Christian People's Party'), the major parties which took part in the election were newly formed from elements of parties that had been active during the German Empire. The three-week-old Communist Party of Germany (KPD) chose not to participate.

The Bavarian Soviet Republic, also known as Bavarian Council Republic or the Munich Soviet Republic (German: Räterepublik Baiern, Münchner Räterepublik), was a short-lived unrecognised socialist state in Bavaria during the German revolution of 1918–1919.

A group of communists and anarchists declared the Bavarian Soviet Republic on 6 April 1919, forcing the government of the existing Free State of Bavaria to flee to Bamberg in northern Bavaria. The members of the new government, led by playwright Ernst Toller, had no political or administrative experience, and after just six days in power they were ousted in a putsch organized by the Communist Party of Germany (KPD). The new head of state, the Russian-German Bolshevik Eugen Leviné, quickly instituted communist measures such as worker control of factories. Food shortages led to popular unrest, and on 3 May the Soviet Republic was put down by soldiers of the German Army supported by paramilitary Freikorps troops. Some 600 people died in the fighting. On 14 August 1919, the democratic Free State of Bavaria resumed control over all of Bavaria.

The rise to power of Adolf Hitler, dictator of Germany during the Nazi era from 1933 until his suicide in 1945, began in the newly established Weimar Republic in September 1919, when Hitler joined the Deutsche Arbeiterpartei (DAP; German Workers' Party). He quickly rose to a place of prominence and became one of its most popular speakers. In an attempt to more broadly appeal to larger segments of the population and win over German workers, the party name was changed to the Nationalsozialistische Deutsche Arbeiterpartei (NSDAP; National Socialist German Workers' Party), commonly known as the Nazi Party, and a new platform was adopted. Hitler was made the party leader in 1921 after he threatened to otherwise leave. By 1922, his control over the party was unchallenged. The Nazis were a right-wing party, but in the early years they also had anti-bourgeois elements. Hitler later initiated a purge of these elements and reaffirmed the Nazi Party's support for collaboration with German businesses. This included killings of Hitler's critics within the party during the Night of the Long Knives, which also served as a tool to secure power.

In 1923, Hitler attempted a coup in Bavaria, known as the Beer Hall Putsch. He was arrested and put on trial, which garnered him national fame. He was sentenced to five years in fortress confinement, but served only nine months. During this time, he wrote Mein Kampf, which became the handbook of his ideology of Nazism. Once released, Hitler switched tactics, opting to instead seize power through legal and democratic means. During the 1920s, he and the Nazis ran on a platform of anti-communism, antisemitism, and ultranationalism. Party leaders vociferously criticized the ruling democratic government and the Treaty of Versailles, while promising to turn Germany into a world power. Most Germans were indifferent to Hitler's rhetoric as the German economy began to recover, in large part due to loans from the United States under the Dawes Plan. The German political landscape was dramatically affected by the Wall Street crash of 1929. The Great Depression brought the German economy to a halt and further polarized German politics. During this tumultuous time, the German Communist Party also began campaigning and called for a revolution. Some business leaders, fearful of a communist takeover, began supporting the Nazi Party.

The Social Democratic Party of Germany (German: Sozialdemokratische Partei Deutschlands [zoˈtsi̯aːldemoˌkʁaːtɪʃə paʁˌtaɪ ˈdɔʏtʃlants], SPD [ɛspeːˈdeː] ) is a social democratic political party in Germany. It is one of the major parties of contemporary Germany. Lars Klingbeil has been the party's leader since the 2021 SPD federal Party convention together with Bärbel Bas, who joined him in June 2025. After losing the 2025 federal election, the party is part of the Merz government as the junior coalition partner. The SPD is a member of 12 of the 16 German state governments and is a leading partner in seven of them.

The SPD was founded in 1875 from a merger of smaller socialist parties, and grew rapidly after the lifting of Germany's repressive Anti-Socialist Laws in 1890 to become the largest socialist party in Western Europe until 1933. In 1891, it adopted its Marxist-influenced Erfurt Program, though in practice it was moderate and focused on building working-class organizations. In the 1912 federal election, the SPD won 34.8 percent of votes and became the largest party in the Reichstag, but was still excluded from government. After the start of the First World War in 1914, the party split between a pro-war mainstream and the anti-war Independent Social Democratic Party, some members of which later formed the Communist Party of Germany (KPD). The SPD played a leading role in the German revolution of 1918–1919 and in the foundation of the Weimar Republic. The SPD politician Friedrich Ebert served as the first president of Germany from 1919 to 1925.

The Socialist Unity Party of Germany (German: Sozialistische Einheitspartei Deutschlands, pronounced [zotsi̯aˈlɪstɪʃə ˈʔaɪnhaɪtspaʁˌtaɪ ˈdɔʏtʃlants] ; SED, pronounced [ˌɛsʔeːˈdeː] ) was the founding and ruling party of the German Democratic Republic (GDR) from the country's establishment in 1949 until the Peaceful Revolution of 1989. Formed in 1946 through a forced merger of the East German branches of the Communist Party of Germany and the Social Democratic Party of Germany, the SED aimed to consolidate working-class politics under a common platform of Marxism–Leninism. The SED played a central role in the building of East Germany's socialist institutions, economy and governance, steering the country's development in line with a planned economy and collective social welfare.

The SED was structured according to democratic centralism, with authority flowing from the Party Congress through the Central Committee to the Politburo. Though the Party Congress formally held supreme authority, the Politburo and the Secretariat carried out decision-making between congresses. The SED's General Secretary wielded absolute power, often serving concurrently in key state roles. Walter Ulbricht, the party's leading figure from the early 1950s until 1971, oversaw the construction of East Germany's socialist economy and institutions, but was eventually deposed for a series of failed economic reforms aimed at raising the GDR's competitiveness, as well as a worsening relationship with the Soviets. His successor, Erich Honecker, presided over a period of increasing economic stagnation until 1989. The SED promoted universal education and healthcare, the collectivisation of agriculture and the nationalisation of industry, while placing emphasis on ideological training, including mandatory instruction in Marxism–Leninism and the Russian language in schools and universities. Near the end of the Cold War, it remained skeptical of perestroika and glasnost under Soviet leader Mikhail Gorbachev, viewing these as destabilising for the socialist project. This position eventually contributed to East Germany's political isolation and the rapid transformation that followed in 1989.

General elections were held in East Germany on 18 March 1990. These were the first free elections held in the region since the turbulent Weimar days of 1932 and would become the only truly democratic vote in the German Democratic Republic (GDR). The election stood as a final verdict on four decades of one-party rule by the Socialist Unity Party of Germany (SED)–led National Front. It took place against the backdrop of the German reunification process, which had already begun to gather momentum.

The contest was swept by the Alliance for Germany, a coalition led by the newly reconstituted East German Christian Democratic Union (CDU), which captured 192 of the 400 seats in the Volkskammer and had ran on a promise of swift reunification with West Germany. The Social Democratic Party (SPD), re-established only months earlier after its forced 1946 merger with the Communist Party of Germany (KPD), was widely tipped to win but instead came second with 88 seats. In third was the former ruling SED, now rebranded as the Party of Democratic Socialism (PDS), which secured 66 seats. The Alliance fell just short of an outright majority having needed 201 seats to govern alone.

Nazi concentration camps were a system of concentration camps (German: Konzentrationslager) built and operated by Nazi Germany between 1933 and 1945. There were more than a thousand, including subcamps in Germany and German-occupied Europe.

The first camps were established in March 1933 immediately after Adolf Hitler became Chancellor of Germany. Following the 1934 purge of the SA, the concentration camps were run exclusively by the SS via the Concentration Camps Inspectorate and later the SS Main Economic and Administrative Office. Initially, most prisoners were members of the Communist Party of Germany, but as time went on different groups were arrested, including "habitual criminals", "asocials", and Jews. After the beginning of World War II, people from German-occupied Europe were imprisoned in the concentration camps. About 1.65 million people were registered prisoners in the camps, of whom about a million died during their imprisonment. Most of the fatalities occurred during the second half of World War II, including at least a third of the 700,000 prisoners who were registered as of January 1945. Following Allied military victories, the camps were gradually liberated in 1944 and 1945, although hundreds of thousands of prisoners died in death marches.

Rosa Luxemburg (/ˈlʌksəmbɜːrɡ/ LUK-səm-burg; Polish: Róża Luksemburg [ˈruʐa ˈluksɛmburk] ; German: [ˈʁoːza ˈlʊksm̩bʊʁk] ; 5 March 1871 – 15 January 1919) was a Polish and naturalised-German Marxist theorist and revolutionary. She was a leading theorist of the Social Democratic Party of Germany (SPD) and later co-founded the anti-war Spartacus League, which evolved into the Communist Party of Germany (KPD). An influential member of the international socialist movement, she is remembered for her writings on imperialism and revolution, and as a champion of socialist democracy who famously stated, "Freedom is always and exclusively freedom for the one who thinks differently."

Born and raised in Russian-ruled Poland to a secular Jewish family, Luxemburg became active in revolutionary politics in her youth. She co-founded the Social Democracy of the Kingdom of Poland and Lithuania (SDKPiL), a party that rejected Polish nationalism in favour of an international class struggle. After moving to Germany in 1898, she became the foremost voice of the SPD's revolutionary wing. In her 1900 pamphlet Social Reform or Revolution?, she defended the necessity of revolution against the reformist theories of Eduard Bernstein, arguing that the struggle for reforms was a means to an end, not an end in itself. Inspired by the 1905 Russian Revolution, she developed a theory of the mass strike as the proletariat's most important revolutionary tool, emphasizing the spontaneous creativity of the working class.

Freikorps (German: [ˈfʁaɪˌkoːɐ̯], "Free Corps" or "Volunteer Corps") were irregular German and other European paramilitary volunteer units that existed from the 18th to the early 20th centuries. They effectively served as mercenaries or private military companies, regardless of their own nationality. In German-speaking countries, the first so-called Freikorps ("free regiments", Freie Regimenter) were formed in the 18th century from native volunteers, enemy renegades, and deserters. These sometimes exotically equipped units served as infantry and cavalry (or, more rarely, as artillery); sometimes in just company strength and sometimes in formations of up to several thousand strong. There were also various mixed formations or legions. The Prussian von Kleist Freikorps included infantry, jäger, dragoons and hussars. The French Volontaires de Saxe combined uhlans and dragoons.

In the aftermath of World War I and during the German Revolution of 1918–19, Freikorps, consisting partially of World War I veterans, were raised as paramilitary militias. They were ostensibly mustered to fight on behalf of the government against the German communists attempting to overthrow the Weimar Republic. However, many Freikorps also largely despised the Republic and were involved in assassinations of its supporters, later aiding the Nazis in their rise to power.

Volksgemeinschaft (German pronunciation: [ˈfɔlksɡəˌmaɪnʃaft] ) is a German expression meaning "people's community", "folk community", "national community", or "racial community", depending on the translation of its component term Volk (cognate with the English word "folk"). This expression originally became popular during World War I as Germans rallied in support of the war, and many experienced "relief that at one fell swoop all social and political divisions could be solved in the great national equation". The idea of a Volksgemeinschaft was rooted in the notion of uniting people across class divides to achieve a national purpose, and the hope that national unity would "obliterate all conflicts - between employers and employees, town and countryside, producers and consumers, industry and craft".

After the November Revolution of 1918, the overthrow of the constitutional monarchy, and Germany's defeat in World War I, the concept of Volksgemeinschaft remained popular, especially on the right wing of German politics, in opposition to the class struggle advocated by Marxist parties like the Social Democrats and the Communists. The monarchist German Conservative Party became the German National People's Party (DVNP) and the National Liberal Party reorganized itself into the German People's Party, with the new names intended partly as references to Volksgemeinschaft.

Arthur Koestler CBE (UK: /ˈkɜːstlər/, US: /ˈkɛst-/; German: [ˈaʁtuːɐ̯ ˈkœstlɐ]; Hungarian: Kösztler Artúr [ˈkøstlɛr ˈɒrtuːr]; 5 September 1905 – 1 March 1983) was an Austro-Hungarian-born author and journalist. Koestler was born in Budapest, and was educated in Austria, apart from his early school years. In 1931, Koestler joined the Communist Party of Germany but resigned in 1938 after becoming disillusioned with Stalinism.

Having moved to Britain in 1940, Koestler published his novel Darkness at Noon, an anti-totalitarian work that gained him international fame. Over the next 43 years, Koestler espoused many political causes and wrote novels, memoirs, biographies, and numerous essays. In 1949, Koestler began secretly working with a British Cold War anti-communist propaganda department known as the Information Research Department (IRD), which would republish and distribute many of his works, and also fund his activities. In 1968, he was awarded the Sonning Prize "for [his] outstanding contribution to European culture". In 1972, he was made a Commander of the Order of the British Empire (CBE).

The Sturmabteilung ([ˈʃtʊʁmʔapˌtaɪlʊŋ] ; SA; lit. 'Storm Division' or loosely 'stormtroopers') was the original paramilitary organisation under Adolf Hitler and the Nazi Party of Germany. It played a significant role in Hitler's rise to power in the 1920s and early 1930s. Its primary purposes were providing protection for Nazi rallies and assemblies, disrupting the meetings of opposing parties, fighting against the paramilitary units of the opposing parties, especially the Roter Frontkämpferbund of the Communist Party of Germany (KPD) and the Reichsbanner Schwarz-Rot-Gold of the Social Democratic Party of Germany (SPD), and intimidating Romani, trade unionists, and especially Jews.

The SA were colloquially called Brownshirts (Braunhemden) because of the colour of their uniform's shirts, similar to Benito Mussolini's Blackshirts. The official SA uniform was a brown shirt with a brown tie. The colour came about because a large shipment of Lettow-shirts, originally intended for the German colonial troops in Germany's former East Africa colony but which never reached its destination because of naval blockades, was purchased in 1921 by Gerhard Roßbach for use by his Freikorps paramilitary unit. They were later used for his Schill Youth organization in Salzburg, and in 1924 were adopted by the Schill Youth in Germany. The "Schill Sportversand" then became the main supplier for the SA's brown shirts. The SA developed pseudo-military titles for its members, with ranks that were later adopted by several other Nazi Party groups.

Otto Braun (28 September 1900 – 15 August 1974) was a German communist journalist and functionary of the Communist Party of Germany with a long and varied career. His most significant role was as a Comintern agent sent to China in 1934 to advise the Chinese Communist Party (CCP) on military strategy during the Chinese Civil War. At the time Braun adopted a Chinese name, Li De (Chinese: 李德; pinyin: Lǐ Dé). It was only many years later that it became known that Otto Braun and "Li De" were the same person.