[Tennyson]

Communist parties in Western Europe were enthusiastically advocating non-White immigration in the 1970s and 1980s.

However, it is remarkable that the European Communist governments kept their countries racially very homogenous. Very few non-White people migrated to Communist countries and they were mostly students who were supposed to leave after finishing their studies.

What is the explanation of this discrepancy? I suspect that the Kremlin knew that racial diversity is harmful to the military and economic might of any country and thus instructed the Western communists to advocate immigration to destabilize the West.

I'd be grateful if somebody could provide sources which confirm this or any communist policy statements related to immigration.