Anti-Socialist Laws in the context of "Reichsgesetzblatt"

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.

Eduard Bernstein (German: [ˈeːduaʁt ˈbɛʁnʃtaɪn]; 6 January 1850 – 18 December 1932) was a German social democratic politician and socialist theorist. A member of the Social Democratic Party (SPD), Bernstein is best known for his reformist challenge to Marxism known as evolutionary socialism or revisionism, in which he questioned the revolutionary predictions of Karl Marx and advocated for a gradual, parliamentary path to socialism. His political and theoretical work played a significant role in the development of modern social democracy and reformist socialism.

Born into a lower-middle-class Jewish family in Berlin, Bernstein became active in socialist politics in his early twenties. He spent years in exile in Switzerland and London during the period of the Anti-Socialist Laws in Germany, where he became a close associate of Friedrich Engels. During his time in London, his interactions with the reformist Fabian Society and his observation of the stability of late Victorian capitalism led him to question key tenets of orthodox Marxism.

Karl Johann Kautsky (/ˈkaʊtski/; German: [ˈkaʊtski]; 16 October 1854 – 17 October 1938) was an Austrian-born German Marxist theorist. One of the most authoritative promulgators of orthodox Marxism after the death of Friedrich Engels in 1895, he was for decades the leading theorist of the Social Democratic Party of Germany (SPD) and the Second International. His influence was so pervasive that he was often called the "Pope of Marxism", with his views remaining dominant until the outbreak of World War I in 1914. His influence extended beyond Germany, shaping the development of Marxism in the Russian Empire, where he was seen by figures like Vladimir Lenin as the leading authority on Marxist theory.

Born in Prague and educated in Vienna, Kautsky became a Marxist in the early 1880s while in exile in Zurich. He founded the influential journal Die Neue Zeit in 1883 and was its editor for 35 years. From 1885 to 1890, he lived in London, where he became a close friend of Engels. Following the repeal of Germany's Anti-Socialist Laws, he authored the theoretical section of the SPD's 1891 Erfurt Program. His commentary on the program, The Class Struggle, became a popular and widely circulated summary of Marxism. Kautsky's theoretical framework reinterpreted Karl Marx's critique of political economy into a doctrine of historical-empirical laws predicting the inevitable concentration of capital, polarisation of society, and immiseration of the working class.