Which U.S. President said, "Every reform movement has a lunatic fringe"?

The famed U.S. President who said, "Every reform movement has a lunatic fringe" was President Theodore Roosevelt. He was the 26th President of the United States of America. The prior quote is just one of many that Roosevelt used when he was talking about government, politicians, and reactionary people living within a republican society such as the USA.

Roosevelt's point was that powers of sovereignty are vested in the people and are exercised by the people, either directly or through specific representatives chosen by the people, to whom powers are specially delegated. No reform movement, other group or body, has any power to act for the entire society, unless it is properly authorized.