On July 28, 1931, Rao narrowly survived an assassination attempt. It was a hot day and Rao was sitting outside the Helmar Social Club, which is located on a busy street in Harlem. Bootleggers Vincent "Mad Dog" Coll and Frank Giordano drove up and stopped their car in front of the club. Coll was working for Joseph Rock, an out-of-town bootlegger who was attempting to infringe on Rao's territory. The gunmen opened fire on Rao with machine guns and shotguns. Four young children were wounded and a five-year-old boy, Michael Vengelli, was murdered. Though seriously wounded, Rao survived the attack and escaped the scene.