Yes - The first amendment is as follows:
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances."
In that vein, I would see the government limiting the ability for someone to speak out against anything as a violation of their Free Speech/First Amendment rights.