Socialist movement in the context of "Belgian general strike of 1893"

Anarchism is a political philosophy and movement that seeks to abolish all institutions that perpetuate authority, coercion, or hierarchy, primarily targeting the state and capitalism. Anarchism advocates for the replacement of the state with stateless societies and voluntary free associations. A historically left-wing movement, anarchism is usually described as the libertarian wing of the socialist movement (libertarian socialism).

Although traces of anarchist ideas are found all throughout history, modern anarchism emerged from the Enlightenment. During the latter half of the 19th and the first decades of the 20th century, the anarchist movement flourished in most parts of the world and had a significant role in workers' struggles for emancipation. Various anarchist schools of thought formed during this period. Anarchists have taken part in several revolutions, most notably in the Paris Commune, the Russian Civil War and the Spanish Civil War, whose conclusion marked the end of the classical era of anarchism. In the last decades of the 20th and into the 21st century, the anarchist movement has been resurgent once more, growing in popularity and influence within anti-capitalist, anti-war and anti-globalisation movements.

A communist state, also known as a Marxist–Leninist state, is a form of government that combines the state leadership of a communist party, Marxist–Leninist political philosophy, and an official commitment to the construction of a communist society. Modern communism broadly grew out of the socialist movement in 19th-century Europe as a program to replace capitalism with a stateless, classless, and moneyless society, but its application as Marxism–Leninism began later in the Soviet Union under Joseph Stalin.

In the 20th century, several communist states were established, first in Russia with the Russian Revolution of 1917 and then in portions of Eastern Europe, Asia, and a few other regions after World War II. The institutions of these states were heavily influenced by the writings of Karl Marx, Friedrich Engels, Vladimir Lenin, Joseph Stalin and others. However, the political reforms of Soviet leader Mikhail Gorbachev known as Perestroika and socio-economic difficulties produced the revolutions of 1989, which brought down all the communist states of the Eastern Bloc bar the Soviet Union. The repercussions of the collapse of these states contributed to political transformations in the Soviet Union, Yugoslavia, and several other non-European communist states. Presently, there are five states which are officially communist in the world: China, Cuba, Laos, North Korea and Vietnam.

Reformism is a political tendency advocating the reform of an existing system or institution – often a political or religious establishment – as opposed to its abolition and replacement via revolution.

Within the socialist movement, reformism is the view that gradual changes through existing institutions can eventually lead to fundamental changes in a society's political and economic systems. Reformism as a political tendency and hypothesis of social change grew out of opposition to revolutionary socialism, which contends that revolutionary upheaval is a necessary precondition for the structural changes necessary to transform a capitalist system into a qualitatively different socialist system. Responding to a pejorative conception of reformism as non-transformational, philosopher André Gorz conceived non-reformist reform in 1987 to prioritize human needs over capitalist needs.

Syndicalism is a labor movement within society that, through industrial unionism, seeks to unionize workers according to industry and advance their demands through strikes and other forms of direct action, with the eventual goal of gaining control over the means of production and the economy at large through social ownership.

Syndicalist unions first emerged in Spain and North America in the 1870s, before rising to prominence in France and later emerging on other continents. Syndicalist movements were most predominant amongst the socialist movement during the interwar period that preceded the outbreak of World War II. Major syndicalist organizations included the General Confederation of Labor (CGT) in France, the Confederacion Nacional del Trabajo (CNT) in Spain, the Italian Syndicalist Union (USI), the Free Workers' Union of Germany (FAUD), and the Argentine Regional Workers' Federation (FORA). Although they did not regard themselves as syndicalists, the Industrial Workers of the World (IWW) (nicknamed "Wobblies") in the United States, the Irish Transport and General Workers' Union (ITGWU), and the Canadian One Big Union (OBU) are considered by most historians to belong to this movement.