Cohn, Roy (20 February 1927–02 August 1986), anti-Communist crusader, powerbroker, and attorney, was born Roy Marcus Cohn in New York City, the son of Al Cohn, a state judge and Democratic party figure, and Dora Marcus. Dora’s father, Sam Marcus, had founded the Bank of United States, which served a largely Jewish, immigrant clientele. The bank failed during the Great Depression, and the trial of Dora’s brother Bernie Marcus for fraud was one of the formative influences of Roy’s childhood. Al Cohn was the son of a pushcart peddler, had attended law school at night, and used his political influence in the Bronx, as well as Dora’s money, to gain a position as a state trial court judge and later a seat on the intermediate state appellate court. Roy was educated at the Horace Mann School. He had an undistinguished career as an undergraduate at Columbia College and was only admitted to Columbia Law School because of the dearth of students caused by World War II and his father’s political influence. Roy did, however, finish both college and law school in three and a half years and, at age twenty, was too young to enter the bar. He spent a year as a clerk/typist for the U.S. attorney for New York and was promoted to assistant U.S. attorney after his twenty-first birthday....