I thought this was an interesting quote from the article (from the former chief of the gang unit in the New Jersey U.S. Attorney's office):

"Street gangs operate in a much more open and notorious fashion, which leads to a lot more street gang members getting arrested in law enforcement sweeps than members of organized crime … Street gangs, even more than mobsters, tend to cooperate with law enforcement when they're arrested, so if you have deals with a street gang member you really run the risk that he'll get arrested and flip on you."