Editing Fourth International (section)

== See also ==
* [[Entryism]]
* [[List of left-wing internationals]]
* [[List of Trotskyist internationals]]
* [[List of Trotskyist organizations by country]]

Leftist Internationals include:

'''United left wing'''
* [[International Workingmen's Association]], the First International (1864–1876)

'''Anarchist'''
* [[International Anarchist Congresses]]: at first with the 1st International; followed by:
** [[International Working People's Association]], sometimes known as the "Black" International (1881-1887); anarchist
** [[International Workers' Association – Asociación Internacional de los Trabajadores|International Workers' Association]] – Asociación Internacional de los Trabajadores [[IWA–AIT]] (est. 1922) and the [[International of Anarchist Federations]] (IFA; est. 1968), with several spin-offs: [[Libertarian Communist International]] (est. 1954), [[Anarchist International Conference]] (est. 1958), [[International Libertarian Solidarity]] (SIL/ILS) network (est. 2001)

'''Socialist and labour''''
* [[Second International]] (1889–1916), socialist and labour
* [[Berne International]] (est. 1919), socialist
* [[International Working Union of Socialist Parties]] (IWUSP), a.k.a. 2½ International or Vienna International, founded by [[Austromarxism|Austro-Marxists]] (1921-1923)
* [[Labour and Socialist International]] (1923-1940), created by merger of Vienna and Berne Internationals

'''Communist'''
* [[Communist International]], a.k.a. Third International or Comintern (1919-1943)

'''Trotskyist'''
* Fourth International (1938-1953 schism) led by the International Secretariat (ISFI); followed by [[List of Trotskyist internationals|Trotskyist internationals]].
* [[Fourth International (post-reunification)]] (since 1963), by reunification of ISFI and parts of the [[International Committee of the Fourth International]] (ICFI)

'''Democratic socialism'''
* [[Socialist International]] (est. 1951)

'''Reunification efforts'''
* [[Fifth International]], a phrase referring to socialist and communist groups aspiring to create a new workers' international.