Where'd you get that information? Just curious, as I've never heard it before.
Any biography of Reagan. He underwent a political conversion while head of the actors’union, when the communists were trying to take it over. That would be in the mid and late 40s. After his second marriage, he moved in new circles and entered Republican politics. His anti-communism was not just intellectual, it was visceral. His admiration of FDR was the appreciation of a great leader, not all his policies or all his deeds.