Hippies don’t necessarily make good Marxists, and Marxists are certainly not always hippies. As Patrick Barr-Melej’s wonderfully lively and illuminating cultural history of Chile during the late 1960s and early 1970s makes clear, the ideals and aesthetics of the “Age of Aquarius” often collided with those of the “Age of Allende.” Psychedelic Chile: Youth, Counterculture, and Politics on the...