I don’t have any problem differentiating between “socialists” and “people who changed their position 180 degrees when the CP sent down the directive”.
In Seeger’s own words, “I became a member of the Communist Party, and when they said fight for peace, I did, and when they said fight Hitler, I did.”
Mind you, I agree with his telling HUAC to get stuffed. Our government’s proper mission in those day was to defend against the very real threats of the Soviet Army and KGB, not against gullible musicians.
