Norbert Guterman and Leo Lowenthal, members of the Frankfurt School who emigrated to America in the 1930s, analyzed the media appeals used by pro-fascist agitators during World War II. They studied radio broadcasts, pamphlets, and speeches to identify techniques of political manipulation that these 'prophets' used to reach their audiences. The agitators, they found, did not argue rationally but instead appealed to grievance, offered enemies to blame, and promised followers special knowledge about hidden conspiracies. Guterman and Lowenthal detailed specific rhetorical patterns: how agitators presented themselves as persecuted truth-tellers, how they transformed diffuse anxieties into focused hatred, how they maintained followers' emotional investment without requiring action. The book was published in 1949 to modest attention, but its analysis has proven prescient. The authors warned that the techniques they identified were not limited to the lunatic fringe but could, under the right conditions, find wider purchase. Reading the book today, one is struck by how accurately it describes media manipulation tactics that have become mainstream. This is a work of social psychology that reads like prophecy.