To what extent, if any, was there institutionalized racism in the USSR?

by kiltsandrevenge

I understand that Socialism and Communism are (and were supposed to be) international movements that transcend race, and that the USSR was a union of states. However, Russia seems to have been the dominant country within the Soviet Union, and I have heard that modern Russia can be a pretty racist place.

Georgy_K_Zhukov

Only focused on the war years, but this might be of interest.