Left-wing terrorism (sometimes called Marxist–Leninist terrorism or revolutionary/left-wing terrorism) is terrorism meant to overthrow conservative or capitalist systems and replace them with Marxist–Leninist, socialist or Anarchist societies. Left-wing terrorism also occurs within already socialist states as activism against the current ruling government.
The ideology of left-wing terrorists is heavily influenced by Marxist and other communist and socialist and liberal practice.Narodnaya Volya, a 19th-century terrorist group that killed tsar Alexander II of Russia in 1881, and developed the concept of propaganda by the deed is a major influence.
According to Sarah Brockhoff, Tim Krieger and Daniel Meierrieks, while left-wing terrorism is ideologically motivated, nationalist-separatist terrorism is ethnically motivated. They argue that the revolutionary goal of left-wing terrorism is non-negotiable, whereas nationalist terrorists are willing to make concessions. The rigidity of the demands of left-wing terrorists may explain their lack of support relative to nationalist groups. Nevertheless, many on the revolutionary left have showed solidarity for national liberation groups employing terrorism, such as Irish nationalists, the Palestine Liberation Organization and the South American Tupamaros, seeing them as engaged in a global struggle against capitalism. Since nationalist sentiment is fueled by socio-economic conditions, some separatist movements, including the Basque ETA, the Provisional Irish Republican Army and the Irish National Liberation Army incorporated communist and socialist ideology into their policies.
Left-wing terrorism has its roots in 19th and early 20th century anarchist terrorism and became pronounced during the Cold War. Modern left-wing terrorism developed in the context of the political unrest of 1968. In Western Europe, notable groups included the West German Red Army Faction (RAF), the Italian Red Brigades, the French Action Directe (AD), and the Belgian Communist Combatant Cells (CCC). Asian groups have included the Japanese Red Army and the Liberation Tigers of Tamil Eelam, although the latter organization later adopted nationalist terrorism. In Latin America, groups that became actively involved in terrorism in the 1970s and 1980s included the Nicaraguan Sandinistas, the Peruvian Shining Path, and the Colombian 19th of April Movement.