Further:

"I also do not know of anyone from the opposition that they [Pete Seeger and/or the Smothers Brothers] invited."

Of course not! Nor did anyone "from the opposition" (and who are you referring to here, Conrad? The American Nazi Party? The Ku Klux Klan? Or for that matter, the Heritage Foundation or the Project for the New American Century?) invite them. They were hired to sing by entrepreneurs, concert promoters, and festival organizers who knew exactly who they were and what sorts of songs they were liable to be singing. If Pete were hired by the International Longshoreman's Union or the Communications Workers of America, they would certainly not be happy with him if he invited a fascist folk singer or a racist folk singer (if there ever were such things!) to join him on stage.

Think about it!

No one from the Aryan Nations or other White Supremacist groups ever invited Pete to sing at any of their functions.

Also, think about that!

"This would make a good research paper."

It would make a damned thin research paper.

Don Firth

P. S. Okay, Conrad, if you want to hear a concert in which all points of view are represented, then I suggest that you organize it yourself. And see just how well it goes over.