Donald Trump’s brash and bullying style was learned at the heel of Roy Cohn, one of America’s most infamous lawyers.
They met at Le Club, a private disco on the Upper East Side frequented by Jackie Kennedy, Al Pacino, and Diana Ross, according to Trump: The Saga of America’s Most Powerful Real Estate Baron. Donald Trump, the young developer, quickly amassing a fortune in New York real estate and Roy Cohn, America’s most loathed yet socially successful defense attorney who had vaulted to infamy in the 1950s while serving as legal counsel to Senator Joseph McCarthy.
The friendship they forged would provide the foundation for Trump’s eventual presidential campaign. And in hindsight, it serves as a tool for understanding Donald Trump the Candidate, whose bumper sticker-averse declarations—undocumented Mexican immigrants are “criminals” and “rapists”; Senator John McCain is “not a war hero”—have both led him to the top of the Republican primary polls and mistakenly convinced many that he is a puzzle unworthy of solving. It may appear that way, but Trump isn’t just spouting off insults like a malfunctioning sprinkler system—he’s mimicking what he learned some 40 years ago.
A longtime friend of Trump’s who was introduced to the candidate by Cohn told me it’s a shame that Cohn’s not alive to see the chaos his protégé has wrought.
“He would have just loved what’s going on right now,” the friend said. “Roy liked upsetting the establishment.”

Roy Marcus Cohn, born in the Bronx in 1927, was the son of Albert Cohn, a judge and prominent Democrat. He graduated from Columbia Law School in 1947, and the day he was admitted to the bar, according to a New York Times obituary, he got a job in the office of the Manhattan United States Attorney thanks to his father’s connections.
He became known for his arrogant courtroom style, notably in the case of Julius and Ethel Rosenberg, American citizens convicted of conspiring to give information about the atomic bomb to the Soviet Union. They were executed, and Cohn was promoted to assistant U.S. Attorney. 
He moved to Washington, where his first assignment was to prepare the indictment of Owen Lattimore, an expert on China and professor at Johns Hopkins University who had been accused of being “the top Russian espionage agent in the United States” by Senator Joe McCarthy.
The charges were ultimately dismissed, but Cohn’s aggressive performance left a lasting impact on McCarthy, who named him chief counsel to the Senate Permanent Subcommittee on Investigations. (Robert F. Kennedy was assistant counsel.)
McCarthy and Cohn, who was gay and would later die of AIDS, claimed that foreign communists had blackmailed closeted homosexual U.S. government employees into giving them secrets. The charge resulted in President Eisenhower’s Executive Order 10450, which allowed the government to deny homosexuals employment.
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Cohn helped McCarthy wage similar witch-hunts on the State Department, Voice of America, and the Army.
When McCarthy was finally censured, in 1954, Cohn was thought to be finished, too. 
He moved back to New York City and joined the law firm Saxe, Bacon & Bolan. But instead of fading into obscurity, Cohn became a socialite with a roster of high-powered, famous, pious, and allegedly murderous clients.
He represented Andy Warhol, Studio 54, Roman Catholic Cardinals Francis Spellman and Terence Cooke, and mafia leaders Carmine “Cigar” Galante and Anthony “Fat Tony” Salerno.
Cohn’s tactics were thought to be so unethical and dishonest by the legal establishment (he was eventually disbarred) that Esquire dubbed him “a legal executioner.”

The reputation didn’t hurt his dance card, however.
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