But four of their number did not escape : John Griffin Jr. , 38 , of Waldwick , N.J. ; Charles Magee , 51 , of Wantagh ; Vito DeLeo , 41 , of Staten Island , and David Williams , 34 , of Hackensack , N.J . The four men are now memorialized in a group portrait at the Manhattan headquarters of their union , Local 94 of the International Union of Operating Engineers , which represents 5,800 workers in New York City commercial buildings .