you would call this "Soviet Union" in the modern times
Me: Where were you born, Mom?
Mom: In the Union of Soviet Socialist Republics, son.
Me: You mean the Soviet homeland, right?
Mom: Yeah.
The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a federal socialist state in Northern Eurasia that existed from 1922 to 1991 and was the largest country in the world. Nominally a union of multiple national Soviet republics, in practice its government and economy were highly centralized,and it was communist.
John-where do you live?
Thomas-The Union of Soviet Socialist Republics