The right of the people in the United States to keep and bear arms.
Second amendment to the U.S. Constitution, which reads in full:
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
There is contention about the capitalization and punctuation and another version reads:
A well regulated militia being necessary to the security of a free state, the right of the people to keep and bear arms shall not be infringed.