With LSD finally gaining mainstream acceptance—just last month, the FDA granted breakthrough status to an LSD formula to treat anxiety—author Norman Ohler investigates how it took so long for the drug’s therapeutic benefits to be taken seriously. His conclusion: Blame the Nazis. Not only was the US government introduced to LSD through Nazi research, the Third Reich “shaped much of the federal government’s early attitudes around it and other psychedelics,” Ohler writes in “Tripped: Nazi Germany, the CIA, and the Dawn of the Psychedelic Age” (Mariner Books), out now. When the Nazis “elicited a potential weaponized use for LSD, the...