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When the F.B.I. released a fat stack of documents about the notorious New York lawyer Roy Cohn on Friday, there were mentions of Ed Sullivan, Jimmy Hoffa, the Detroit Lions fullback Nick Pietrosante , W. Mark Felt (the F.B.I. agent better known as Deep Throat) and Morris Barney Dalitz, a Prohibition Era bootlegger known as Moe who helped turn Las Vegas into a gambling mecca.

One person whose name did not pop up: President Trump, who relied on Mr. Cohn as a lawyer, mentor and more for 13 years starting in the early 1970s, embracing his pugnacious adviser’s hit-back-harder style along the way.

[Read more about Mr. Cohn’s influence on Mr. Trump.]

The format of the release made a definitive digital search nearly impossible, but a close reading of the 748 heavily redacted pages revealed no obvious sign of Mr. Trump.

Still, the letters, memos and other papers were a reminder of the unusual realm inhabited by Mr. Cohn — friend to J. Edgar Hoover, the first director of the Federal Bureau of Investigation, and a regular at once-legendary nightspots the Desert Inn in Las Vegas and El Morocco in Manhattan.