<Tr> <Th> Supreme Soviet </Th> </Tr> <Tr> <Td> <Ul> <Li> Soviet of the Union </Li> <Li> Soviet of Nationalities </Li> <Li> Presidium </Li> </Ul> </Td> </Tr> <Ul> <Li> Soviet of the Union </Li> <Li> Soviet of Nationalities </Li> <Li> Presidium </Li> </Ul> <Li> Soviet of the Union </Li>

What type of government did the soviet union have until 1991