...the infestation of Communists that had taken over every department under Roosevelt (and Truman, for that matter) were finally cleared out....
***
Not entirely.
Actually, Joe McCarthy happened, and while that particular phenomenon was going on, the overtly Communist party members were either fired, prosecuted, or managed to conceal their activities sufficiently that their influence was greatly diminished, at least for a while.
But the re-infestation did not take long.
And with International Socialism at a low ebb for the moment, the maggots have turned to the quasi-socialism of Islam.