To some extent I'm with Lucia.

If Linda wants to speak out politically, she can write opinion articles for newspapers, hook up with an appropriate "soft money" org. and do radio and TV ads saying her piece, hold a press conference, whatever, but if I'm paying good money to see her in concert, I don't really want to here her political view, regardless of whether I agree or not. It's the same as bank tellers, grocery clerks, DMV clerks, etc.

Do I think Linda should be fired, no, but they probably had a right to do so.

Once again, this is not a free-speech issue.