The Communist Party of Australia (CPA) was an Australian political party founded in 1920. The CPA achieved its greatest political strength in the 1940s. It was banned temporarily in 1940 and faced an attempted ban in 1951 before dissolving in 1991.
Its youth wing worked under several different names at different times, including the Young Communist League (YCL); the Young Comrades Club (YCC); the League of Young Democrats (LYD); the Eureka Youth League (EYL); and lastly the Young Socialist League, which in 1984 became part of the Left Alliance.

1920Oct, 30
The Communist Party of Australia is founded in Sydney.
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Events on 1920
- 19Jan
League of Nations
The United States Senate votes against joining the League of Nations. - 8Mar
Arab
The Arab Kingdom of Syria, the first modern Arab state to come into existence, is established. - 19Mar
Treaty of Versailles
The United States Senate rejects the Treaty of Versailles for the second time (the first time was on November 19, 1919). - 28Apr
Soviet Union
Azerbaijan is added to the Soviet Union. - 25Oct
Sinn Féin
After 74 days on hunger strike in Brixton Prison, England, the Sinn Féin Lord Mayor of Cork, Terence MacSwiney dies.