Zachariah Chandler (December 10, 1813 – November 1, 1879) was an American politician, one of the founders of the Republican Party, whose radical wing he dominated as a lifelong abolitionist. He was Mayor of Detroit, a four-term Senator from the state of Michigan, and Secretary of the Interior under President Ulysses S. Grant.As a successful young businessman in Detroit, Chandler supported the Underground Railroad.