Later, de Mohrenschildt proved adept at working his connections at the Dallas Petroleum Club, a hotbed of anti-Kennedy ferment, whose leading members—including oilmen Clint Murchison Sr., H. L. Hunt, and Sid Richardson—were tied to Dulles, Lyndon Johnson, and J. Edgar Hoover. The Petroleum Club also counted D. H. Byrd, the Texas School Book Depository owner, and Mayor Earle Cabell, brother of Dulles’s former CIA deputy, among its regulars.
