They see this as a way to get things done without getting dirty themselves.

NEWYORKER: Covert Operations

He says that "Merck used dirty tactics without a doubt" during this trial, which will be grounds for appeal.

FORBES: Merck Wins Battle, Faces War

"Europeans' perceptions of dirty cash are not without reason, " Ian Thompson, the professor from Oxford University who tested the cash, said in a news release.

CNN: Dirty money? Check your wallet

For without a concerted global response to the problem of dirty money, the world's money-laundering machine will be off on yet another devastating cycle.

ECONOMIST: That infernal washing machine

Without a financial stick, auto manufacturers tend to innovate in dirty technologies.

FORBES: Dirty Little Habits: Cleaning Up The Auto Industry

Dirty players or terriers are what they call footballers with that anger-stoked edge, but strength without sweetness is no use at all.

NEWYORKER: Homework