Harry "Nig" Rosen (born around 1902- date of death unknown) was a Philadelphia mobster who was a major organized crime figure on the east coast with influence as far as Atlantic City, Baltimore and Washington, D.C.
Born Harry Stromberg in Russia, Rosen emerged as a prominent racketeer in southeast Philadelphia and, as head of the 69th Street Gang, became involved prostitution, extortion, labor racketeering and later in narcotics with Arnold Rothstein during the mid-1920s. Succeeding Max "Boo Hoo" Hoff as the city's chief bootlegger during Prohibition, he was a member of the "Big Seven" aligned with the Philadelphia faction along with Waxey Gordon and Irving Blitz, later attending the Atlantic City Conference. Rosen was one of Philly's dominant mobsters and he earned the nickname "Nig" as he once said "I was dark so they called me Nig".
During the 1930s, he and Meyer Lansky worked on expanding drug trafficking operations in Mexico as an alternative to older routes such as Japan now closed with United States entry into World War II. By 1939, a lucrative heroin network had been established from drug traffickers based in Mexico City to major cities across the United States including New York, Philadelphia, Miami and Los Angeles as well as Havana, Cuba.
He and his lieutenant, driver and bodyguard William "Willie" Weisberg, were named as dominant racketeers involved in the numbers racket under testimony from police superintendent George F. Richardson during the Kefauver Committee in 1951.
During the early 1950s, Rosen became partners with Gaetano "Tommy" Lucchese after buying the Sweet Valley Improvement Company which was used by the Lucchese crime family to ship out clothing out of New York's garment district.