There was collaboration with Germans in essentially every ethnic group. However we know that was not the main reason for the deportation of specific ethnic minorities. Stalin deported many Muslims do to believing them to be loyal to Turkey, because the USSR did wish to annex Turkish land. In terms of the Koreans, they were deported officially to prevent infiltration of Japanese spies. However the deportation plans had existed for over a decade so that was obviously untrue. We also know the Koreans were needed as labor in Kazakhstan. Stalin was likely a racist, the doctor plot proves this, as well as his speaking of "polish filth". However we do not have evidence to say the wartime deportations were due to racism.

Sources:

The Deportation and Fate of the Crimean Tatars by J. Otto Pohl

Kim German.Deportation of 1937 as product of russian and soviet national policy.

Beyond Memory:The Crimean Tatar's deportation and return by Greta Uehling.