Tom Campbell Clark served as both U.S. attorney general and associate justice of the U.S. Supreme Court. Clark, who began his legal career as a conservative Texan, became more liberal over time, voting with other members of the Warren Court to provide criminal defendants with greater constitutional rights.

Clark was born on September 23, 1899, in Dallas, Texas. His college studies at the Virginia Military Institute (VMI) were interrupted by service in the Army during World War I. After the war, he completed his bachelor's degree at the University of Texas and earned his law degree there in 1922. After five years in private practice, Clark became the district attorney of Dallas and soon was immersed in Texas politics. Clark's political connections eventually led him to Washington, D.C., where in 1937 he became special assistant to the attorney general. Clark managed several department bureaus but soon specialized in antitrust...