Depends on who "they" is. If the Government punishes you for your speech, that's a violation of the First Amendment. If your fans don't like what you say and stop buying your records, that's not. Look at what happened to the Dixie Chicks.
Chains didn’t drop the Dixie Chicks albums or block their concerts. Michelle Shocked has been kicked off of booked stages. Wonder what her signed contracts say about that.