The leaders of the communist movement in prewar US, and the majority of the red diaper babies in the 20s-40s were Jewish immigrants, most of them Eastern European. For a black American to get in with that crowd, as Yaphet was, it becomes understandable that his mother was Jewish. Dig a little bit, and I bet you will find that his mother was an activist, and that young Yaphet was indoctrinated at an early age.
Well, I guess we can also smear all Christians as some of them claimed to be Christian as well, right?