Soviet operatives targeted three influential American institutions: education, news media, and entertainment.
The influence grew according to a typical logistic function. At the beginning, the influence was small and unnoticeable. At some point, it reached linear growth where it became more and more noticeable. The last phase is when the effect has become so widespread that adding more makes little difference. I don't know if we have reached the last phase yet.
Very true.
And recognizing that workers in our capitalist system would not buy into the "oppressed/oppressor" scenario (workers were becoming too affluent), they focused on the black community and, starting back in the 1930s, the CPUSA and Comintern identified blacks as the new "oppressed" bloc and went to work.