The League for Socialist Action (LSA) was the premier Trotskyist organization in Canada for much of the 20th Century. Throughout its history the LSA went through many different names and iterations. In chronological order it was known as: the International Left Opposition (Trotskyist) of Canada, the Workers Party of Canada, the Socialist Policy Group, the Socialist Workers League, the Revolutionary Workers Party, The Club, the Socialist Education League, and the League for Socialist Action.
The Irish Workers' Group (IWG) was a Marxist political party in Ireland. It originated as the Irish Workers Union, which later called itself the Irish Communist Group, and contained a variety of people who all considered themselves to be Marxists. Some were from an Irish Republican background, and some, including Gerry Lawless, also became involved in Saor Éire.
The League for a Workers' Republic (LWR) was a Trotskyist organisation in Ireland.
The Socialist Labour Group was a Trotskyist group in Britain between 1979 and 1989.
The International League for the Reconstruction of the Fourth International, usually known as the Fourth International, was a Trotskyist political international led by Michel Varga.
Betty Hamilton (1904–1994) was a British Trotskyist.
Francois de Massot is a political activist, writer, and journalist. He is the son of the Surrealist writer Pierre de Massot and an associate of Francis Picabia and André Breton. Massot is of French-Scottish extraction and fluent in English. He has worked as a translator, including in the film industry.
Michel Varga was a Hungarian and French Trotskyist activist.
The Spartacist League is a Trotskyist political grouping which is the United States section of the International Communist League, formerly the International Spartacist Tendency. This Spartacist League named themselves after the original Spartacus League of Weimar Republic in Germany, but has no formal descent from it. The League self-identifies as a "revolutionary communist" organization.
The International Committee of the Fourth International (ICFI) is the name of two Trotskyist internationals; one with sections named Socialist Equality Party which publishes the World Socialist Web Site, and another linked to the Workers Revolutionary Party in the UK.
The Socialist Equality Party (SEP) is a Trotskyist political party in the United States, one of several Socialist Equality parties around the world affiliated with the International Committee of the Fourth International (ICFI). The ICFI publishes daily news articles, perspectives and commentaries on the World Socialist Web Site and maintains Mehring Books as publishing house.
The International Marxist Group (IMG) was a Trotskyist group in Britain between 1968 and 1982. It was the British Section of the Fourth International. It had around 1,000 members and supporters in the late 1970s. In 1980, it had 682 members; by 1982, when it changed its name to the Socialist League, membership had fallen to 534.
The Fourth International (FI), founded in 1938, is a Trotskyist international. In 1963, following a ten-year schism, the majorities of the two public factions of the Fourth International, the International Secretariat (ISFI) and the International Committee (ICFI), reunited, electing a United Secretariat of the Fourth International.
The International Communist League (Fourth Internationalist), earlier known as the international Spartacist tendency (iSt) is a Trotskyist international. Its largest constituent party is the Spartacist League (US). There are smaller sections of the ICL (FI) in Mexico, Canada, France, Germany, Ireland, Italy, Japan, South Africa, Australia, Greece and the United Kingdom.
The Workers Revolutionary Party is a Trotskyist group in Britain once led by Gerry Healy. In the mid-1980s, it split into several smaller groups, one of which retains possession of the name.
The Internationalist Communist Organisation was a Trotskyist political party in France. Its successor was the Internationalist Communist Current of the Workers Party.
Pierre Lambert was a French Trotskyist leader, who for many years acted as the central leader of the French Courant Communiste Internationaliste (CCI) which founded the Parti des Travailleurs.
Orthodox Trotskyism is a branch of Trotskyism which aims to adhere more closely to the philosophy, methods and positions of Leon Trotsky and the early Fourth International, Vladimir Lenin and Karl Marx than other avowed Trotskyists.
Michael Banda, born Michael Alexander Van Der Poorten, was a Sri Lankan communist activist best known as the General Secretary of the British Workers Revolutionary Party.
