The US doesn’t have the legal power to ban films due to the First Amendment, but there are definitely ideas that are so politically radioactive that any sort of

The US doesn’t have the legal power to ban films due to the First Amendment, but there are definitely ideas that are so politically radioactive that any sort of veiled allusion to them (a common term is “dogwhistle”) can create massive backlash. So much so that even giving a concrete example would risk causing a massive tangential flame war, so I won’t risk it.