A political and economic ideology advocating common ownership of production and the abolition of class distinctions; communism.
大学では共産主義の歴史について学んだ。
I studied the history of communism at university.
冷戦期には共産主義と資本主義が対立した。
During the Cold War, communism and capitalism were in opposition.
その国は公式に共産主義を掲げている。
That country officially promotes communism.