 "Forbes" said Giuliani's most controversial deal was throwing in with a 2004 project with Applied DNA Sciences.Its backer, Richard Langley Jr., had previously pleaded guilty to conspiracy to commit wire fraud and commercial bribery in another penny stock scam; another, Jeffrey Salzwedel, had been fined for making "unsuitable" stock recommendations to clients; and the brokerage firm Vertical Capital Partners, a third backer, had been penalized repeatedly for various securities violations.Mexico City hired Giuliani Partners to consult on its crime rate, hoping for a drop in crime like that which New York City had experienced in the 1990s.