Larry Linville (Frank Burns) said he left M*A*S*H after his original five-year contract expired and also said referenced that the show was becoming “preachy.” Farrell never hid his lib beliefs even when a guest on the all-news station(s). Jamie Farr (Klinger), IIRC, is right-of-center politically.
As sad as this story is, it doesn’t take away the fact that the show was funny and at times poignant. I really liked it a lot.
I always wondered why actors would leave a popular show and their careers tanked afterwards. I think it’s safe to assume that these “right-of-center” actors have been blackballed - wish they would come out and name names (Larry Linville is dead now, but there are others who know what’s going on). Mike Farrell is one of the worst, and there are many more doing the bidding of the Enemies of America.
And Linville was constantly berated by his liberal co-stars. It made his work unbearable. I’ve met a few people who knew him and EVERY one of them said he was a hell of a guy.
IIRC, he also served in the Army, stationed in Japan in the late 50's.