Hundreds of actors, artists and entertainers have signed a letter from the American Civil Liberties Union to call for the defense of free speech and expression in the U.S.

The letter, which does not name specific individuals responsible, warns that "government threats" against protected speech led to the temporary removal of Jimmy Kimmel's show from air and present a continued risk for entertainers, journalists, educators and students nationwide.

"In an attempt to silence its critics, our government has resorted to threatening the livelihoods of journalists, talk show hosts, artists, creatives, and entertainers across the board. This runs counter to the values our nation was built upon, and our Constitution guarantees."

More than 400 artists, entertainers and other stars from across the

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