federal criminal law we are coming after you. reporter: the companys involved could be charged with knowingly hiring illegal immigrants or tax documents and wage fraud. new tonight some gangs in new york using mod s to plan their crimes. rick leventhal is cracking their code. reporter: seemingly innocuous symbols take on sinister meeting according to the new york post as a way for gang members to communicate without getting caught. the gas pump is a universal code for gang so if you re going into gang mode you post a pump. the nypd gang squads is to thumbs up for the knuckles facing each other is the sign of the critics and their rivals the bloods signal their affiliation with a magician s top hat. of gang members want to disrespect rivals they will post the symbols upside down or if they really want to taunt their