Other nations that have claimed to be socialist republics include North Korea, Cuba, and the People's Republic of China. The Soviet Union was made up of numerous socialist republics, and the country's full name was the "Union of Soviet Socialist Republics."
Socialist republics operate under their own interpretation of Marxist doctrine, and usually claim to be executing Marx's envisioned dictatorship of the proletariat. The main organ of a socialist republic is the politburo. A institutionalized Communist Party is often common, as well.
See also: Soviet Republic