The Soviet Union was a country that existed from 1922 to 1991, and during that time, it was also known by other names. One of the most common synonyms used was simply "Russia," as it was the largest and most powerful republic within the Soviet Union. Other synonyms included the Union of Soviet Socialist Republics (USSR), the Soviet Empire, and the Red Empire, all of which emphasized the country's communist ideology. Some also referred to it as the Eastern Bloc or the Soviet Bloc, highlighting its position as the leader of a group of communist countries in Eastern Europe. Today, the most commonly used term is simply "Former Soviet Union," referring to the countries that once made up this powerful entity.