The difference is that these crimes (extortion, contract abuse, gasoline theft) are actually stoppable. They have real victims who can complain; they have physical pipelines that can be protected. Drugs generally involve a happy buyer and happy seller transacting in private.

Organized crime doesn't go away overnight. It's not like all the gangs immediately disappeared after the end of Prohibition in the US. You just have to keep taking away their revenue sources, eventually they're too poor to fight back.