Eight years after Baltimore’s four Confederate monuments were quietly removed in the dead of night, they will be displayed publicly once again as part of a museum exhibit in Los Angeles. “Monuments” will include a selection of decommissioned statues honoring Confederate figures — some intact and some vandalized — from Baltimore, Richmond, Charlottesville, New Orleans and Raleigh. These statues “illustrate the evolution of the Confederate monument” from its roots as an effort to honor the dead “to its rise as a crystalline symbol of white supremacist ideology,” according to a description on the website for The Museum of Contemporary Art,...