Crossword Genius

Red states, once, in brief

Ross

I believe the answer is:

ussr

(Other definitions for ussr that I've seen before include "The Beatles? song 'Back in the . . . .'" , "Former association of communist republics" , "In brief, former Soviet federation" , "Former Soviet Union" , "Former union of socialist republics" .)

I've seen this clue in The New York Times.
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