The gang on Wall Street!
In an average year the total dollar value of street crime works out to about $19B. That's all the holdups' carjackings, burglaries, home invasions, petty back robberies, etc.
That, however is nothing compared to what one guy on Wall Street did. Bernie Madoff's ponzi scheme bilked people to the tune of $65B dollars or more than the 3 years of all the street crime. There have been other Wall Street types that stole in one way or another many billions of dollars. And all of this before you count the many trillions that have been stolen from the middle class by those promoting outsourcing etc.
All the other gangs combined are pennies on the dollar compared to Wall Street.
Brian