Is it ensure, insure, or assure?
In general, the rights to freedom of thought, expression, and action, and the protection of these rights from government interference or restriction. Civil liberties are the hallmark of liberal, democratic “free” societies. In the United States, the Bill of Rights guarantees a variety of civil liberties, most notably freedom of assembly, freedom of the press, freedom of religion, and freedom of speech, expressed in the First Amendment. (See civil rights.)