Cal. Education Code § 51530

No teacher giving instruction in any school, or on any property belonging to any agencies included in the public school system, shall advocate or teach communism with the intent to indoctrinate or to inculcate in the mind of any pupil a preference for communism. In prohibiting the advocacy or teaching of communism with the intent of indoctrinating or inculcating a preference in the mind of any pupil for such doctrine, the Legislature does not intend to prevent the teaching of the facts about communism. Rather, the Legislature intends to prevent the advocacy of, or inculcation and indoctrination into, communism as is hereinafter defined, for the purpose of undermining patriotism for, and the belief in, the government of the United States and of this state. For the purposes of this section, communism is a political theory that the presently existing form of government of the United States or of this state should be changed, by force, violence, or other unconstitutional means, to a totalitarian dictatorship which is based on the principles of communism as expounded by Marx, Lenin, and Stalin.