George Mason was the Virginian who refused to sign the U.S. Constitution but was one of the chief supporters of the Bill of Rights. For this reason he is still considered one of the Founding Fathers of the United States of America.
The system of checks and balances is an important part of the Constitution. With checks and balances, each of the three branches of government can limit the powers of the others. ... Each branch “checks” the power of the other branches to make sure that the power is balanced between them.