You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Category: LESSER-KNOWN AMERICANS 
Clue: A. Philip Randolph, who first proposed a march on this city in 1941, also helped organize the one in 1963
washington, d.c.

Category: THE NEW YORK TIMES ENTERTAINMENT 
Clue: "Oil!", a 1927 novel by this muckraker, was on the New York Times Best Seller List in 2008
upton sinclair

Category: FACT 
Clue: Ray Charles Leonard became Sugar Ray Leonard; Walker Smith, Jr. became this boxer

sugar ray robinson