Confederación Nacional del Trabajo in the context of "Mutual aid (politics)"

Anarcho-syndicalism is an anarchist organisational model that centres trade unions as a vehicle for class conflict. Drawing from the theory of libertarian socialism and the practice of syndicalism, anarcho-syndicalism sees trade unions as both a means to achieve immediate improvements to working conditions and to build towards a social revolution in the form of a general strike, with the ultimate aim of abolishing the state and capitalism. Anarcho-syndicalists consider trade unions to be the prefiguration of a post-capitalist society and seek to use them in order to establish workers' control of production and distribution. An anti-political ideology, anarcho-syndicalism rejects political parties and participation in parliamentary politics, considering them to be a corrupting influence on the labour movement. In order to achieve their material and economic goals, anarcho-syndicalists instead practice direct action in the form of strike actions, boycotts and sabotage. Anarcho-syndicalists also attempt to build solidarity among the working class, in order to unite workers against the exploitation of labour and build workers' self-management.

The foundations of anarcho-syndicalism were laid by the anti-authoritarian faction of the International Workingmen's Association (IWMA) and developed by the French General Confederation of Labour (CGT). Anarcho-syndicalism was constituted as a specific tendency following the International Anarchist Congress of Amsterdam in 1907, which led to anarcho-syndicalism becoming the dominant form of trade union organisation in Europe and Latin America. After facing suppression during the Revolutions of 1917–1923, anarcho-syndicalists established the International Workers' Association (IWA) in 1922. Anarcho-syndicalism reached its apex during the Spanish Revolution of 1936, when the National Confederation of Labour (CNT) established an anarcho-syndicalist economy throughout much of the Spanish Republic. Anarcho-syndicalism went into decline after the defeat of the anarchists in the Spanish Civil War in 1939. The movement split into two factions: the "orthodox" faction, which held to traditional syndicalist principles in spite of changing material conditions; and the "revisionist" faction, which aimed to achieve a mass base and work within the framework of newly established welfare states. By the end of the 20th century, the rise of neoliberalism and the collapse of the Eastern Bloc had led to a revival in anarcho-syndicalism, with syndicalist unions once again being established throughout the globe.

The Popular Front (Spanish: Frente Popular) was an electoral alliance and pact formed in January 1936 to contest that year's general election by various left-wing political organizations during the Second Spanish Republic. The alliance was led by Manuel Azaña. In Catalonia and the modern-day Valencian Community, the coalition was known as the Front of the Lefts (Catalan: Front d'Esquerres).

The Popular Front included the Spanish Socialist Workers' Party (PSOE), Communist Party of Spain (PCE), and the republicans: Republican Left (IR), (led by Azaña) and Republican Union (UR), led by Diego Martínez Barrio. This pact was supported by Galician (PG) and Catalan nationalists (ERC), the POUM, socialist union Workers' General Union (UGT), and the anarchist trade union, the Confederación Nacional del Trabajo (CNT). Many anarchists who would later fight alongside Popular Front forces during the Spanish Civil War did not support them in the election, urging abstention instead.

Revolutionary Catalonia (21 July 1936 – 8 May 1937) was the period in which the autonomous region of Catalonia in northeast Spain was controlled or largely influenced by various anarchist, syndicalist, communist, and socialist trade unions, parties, and militias of the Spanish Civil War era. Although the constitutional Catalan institution of self-government, the Generalitat of Catalonia (led by the Republican Left of Catalonia, ERC), remained in power and even took control of most of the competences of the Spanish central government in its territory, the trade unions were de facto in command of most of the economy and military forces, which includes the Confederación Nacional del Trabajo (CNT, National Confederation of Labor) which was the dominant labor union at the time and the closely associated Federación Anarquista Ibérica (FAI, Iberian Anarchist Federation). The Unión General de Trabajadores (UGT, General Worker's Union), the POUM (Workers' Party of Marxist Unification) and the Unified Socialist Party of Catalonia (PSUC, which included the former Communist Party of Catalonia) were also prominent.

Socialist rule of the region began with the Spanish Revolution of 1936, resulting in workers' control of businesses and factories, collective farming in most of the countryside, and attacks against Spanish nationalists and the Catholic clergy. The growing influence of the Communist Party of Spain (PCE) in the Popular Front government and their desire to nationalize revolutionary committees and militias brought it into conflict with the CNT and POUM, resulting in the May Days and the eventual replacement of the CNT by the PSUC as a major political force in Catalonia until their defeat to the Nationalist forces in 1939.

The Spanish Syndical Organization (Spanish: Organización Sindical Española; OSE), popularly known in Spain as the Sindicato Vertical (the "Vertical Trade Union"), was the sole legal trade union for most of the Francoist dictatorship. A public-law entity created in 1940 and defined as subordinate to the ruling party FET y de las JONS, the vertically-structured OSE was a core part of the project for frameworking the Economy and the State in Francoist Spain, following the trend of the new type of "harmonicist" and corporatist understanding of labour relations vouching for worker–employer collaboration developed in totalitarian regimes such as those of Nazi Germany and Fascist Italy in the first half of the 20th century. Up until the early 1950s, it internally worked—at least on a rhetorical basis—according to the discourse of national syndicalism. Previous unions, like the anarchist CNT and the socialist UGT, were outlawed and driven underground, and joining the OSE was mandatory for all employed citizens. It was disbanded in 1977.

The May Days (Catalan: Fets de Maig, Spanish: Jornadas de Mayo), sometimes also called May Events (Catalan: Fets de Maig, Spanish: Sucesos de Mayo, Hechos de Mayo), were a series of clashes between 3 and 8 May 1937 during which factions on the Republican side of the Spanish Civil War engaged one another in street battles in various parts of Catalonia, centered on the city of Barcelona.

In those events, libertarian socialist supporters of the Spanish Revolution, such as the anarchist CNT and the anti-Stalinist POUM, which opposed a centralized government, faced others, such as the Republican government, Catalan government and the Communist Party of Spain, which believed in a strong central government.

The Regional Defence Council of Aragon was an administrative entity created by the Confederación Nacional del Trabajo (CNT) in the context of the Spanish Revolution, during the Spanish Civil War. Until its dissolution, the CRDA controlled and administered the eastern half of Aragon. The price of goods was centrally controlled to mitigate inflation.

The Council of Aragon was the first autonomous government of Aragon since 1707, becoming a government of its own within the Second Spanish Republic. It was established in its first stage (October to December 1936) by anarchist members of the CNT, with eventual representation of all the anti-fascist forces of the Popular Front from December 1936 until its dissolution. Its life was ephemeral since its activities lasted less than a year until it was dissolved by the republican authorities, pressured by the Communist Party of Spain, in August 1937. During its brief lifespan, it implemented some progressive and revolutionary policies.

The Italian Syndicalist Union (Italian: Unione Sindacale Italiana; USI) is an Italian anarcho-syndicalist trade union. Established in 1912 by a confederation of "houses of labour", the USI led a series of general strikes throughout its early years, culminating with the Red Week insurrection against the Italian entry into World War I. During the Biennio Rosso, the USI was at the forefront of the occupation of factories, which saw hundreds of workplaces throughout the country brought under the control of workers' councils. The USI also led the establishment of the International Workers' Association (IWA), which became the main international organisation of anarcho-syndicalist trade unions.

After the rise of Italian fascism, the USI was banned and its members were either arrested, driven underground or forced into exile. By the late-20th century, the USI was eventually reconstituted and once again involved itself in radical strike actions. Expelled from the IWA in 2016, together with the Spanish CNT and German FAU, it established the International Confederation of Labour (ICL), a new international of anarcho-syndicalist trade unions.

Workers' Solidarity (Spanish: Solidaridad Obrera; Catalan: Solidaritat Obrera; SO) was a regional federation of trade unions in Catalonia. Established in 1907, following a series of unsuccessful attempts to establish a national trade union centre in Spain, SO united many of Barcelona's disparate anarchist and socialist trade unions into a single federation. The two factions of the organisation struggled to influence it in their favoured direction, while also clashing with the Radical Republican Party (PRR). In 1909, SO organised a general strike in Catalonia, which escalated into an insurrection known as the Tragic Week. The organisation was suppressed in the wake of the uprising, but managed to reorganise itself following the rise to power of a liberal government. In 1910, it merged together with other regional trade union federations into the National Confederation of Labour (CNT).