“Pro-choice” Catholic politicians support abortion mostly for political reasons. The U.S. bishops say this is unacceptable. So why do they accept it? “Do you know what the Negro is?” Leander H. Perez once asked in 1965. “Animals right out [of] the jungle. Passion. Welfare. Easy life. That’s the Negro.” As a state judge and political boss of Plaquemines Parish in Louisiana, Perez was able to enforce his racist views on the county’s 3,000 to 4,000 African-American residents. Because of him, black people essentially couldn’t vote, get decent housing, or even mix with whites. Yet for decades Perez was in full...