I can't give examples of legitimate companies. Drug trafficking organizations often open up their own businesses to facilitate money laundering activity. They can run a quasi-legitimate business, take their proceeds from drug trafficking, and mix that money with legitimate income. That is a big component of the money laundering process, and it makes it a lot harder for law enforcement scrutiny when you have an entity with mixed income—legitimate income and income from criminal activity.
On March 8th, 2011. See this statement in context.