Determining whether or not censorship is illegal in the U.S. depends on who is doing the censoring. Under the First Amendment of the Bill of Rights, Congress can’t restrict someone’s right to speak free. However, that means that private companies, schools, internet providers, and other entities outside of Congress can censor their students, customers, employees, and more. For example, if a private workplace censors its employees’ internet access, that is legal as the company is not Congress.