What country used commuism?

Several countries have implemented communism at various points in their histories, with the most notable being the Soviet Union, China, Cuba, and Vietnam. The Soviet Union, established after the Russian Revolution in 1917, was the first major state to adopt a communist system. China, under the leadership of the Communist Party since 1949, has since moved towards a more market-oriented economy while maintaining political control. Other countries like Cuba and Vietnam have also embraced communist ideologies, albeit with varying degrees of economic reforms.