The Free Exercise Clause, part of the First Amendment, prevents the U.S. Congress from limiting religious belief or practice, guaranteeing individuals the right to hold and act on their religious convictions without government interference. Historically, its interpretation has shifted from a restrictive to a broader perspective, as demonstrated in cases such as Reynolds v. United States (1878), which supported laws prohibiting polygamy, to Sherbert v.
Verner (1963), where Justice Brennan stressed the need to safeguard religious beliefs from punishment. Later, in Employment Division v. Smith (1990), the protections were narrowed, with the assertion that neutral laws typically do not infringe upon the clause. Justices such as Scalia and O’Connor underscored the tensions between religious freedom and state oversight, illustrating the clause’s ongoing role in reconciling individual liberty with governmental power.