The First Amendment to the U.S. Constitution guarantees the right to freedom of expression. This freedom encompasses the right to speak freely, exercise religion openly, and gather peacefully, all without fear of government interference or retaliation. However, these rights have limits, and must be restrained in instances where they conflict with the rights of others. For this reason, only certain types of speech are considered "protected" by the First Amendment. Perjury and obscenity, for example, are never protected, and can be limited by the government as it wishes. Similarly, the law does not allow people to use freedom of religion as an excuse to act recklessly or exploit others.