The Soviet Union didn't compete at the World Artistic Gymnastics Championships until 1954.

[1] Despite it being their first appearance they dominated the competition, winning gold in both team events and winning 20 total medals.

[2][3] The Soviet Union competed for the last time at the 1991 World Championships as the Soviet Union; the following year they competed as the Commonwealth of Independent States and in 1993 athletes from former Soviet member states officially began competing under their own flags.

[4]