The true statement about the Bill of Rights is: It prevents the federal government from violating citizens' rights.
The Bill of Rights, which comprises the first ten amendments to the U.S. Constitution, was designed to protect individual liberties against infringement by the federal government. It does not protect citizens from their state governments, as originally, the Bill of Rights only applied to the federal level. It also does not give citizens very limited rights; rather, it enumerates several fundamental rights and freedoms. While the Federalists were initially reluctant to support the Bill of Rights, more prominent figures like James Madison came to recognize its importance in gaining ratification of the Constitution.