The US Justice Department says the ex-officers have pleaded guilty to charges that include robbery and extortion.
The department said in a statement today that the officers stole from people during traffic stops and searches of homes.
They also planted evidence to make false arrests and provided false testimony or failed to show up in court to get charges dismissed in exchange for payoffs.
The officers also sold "wholesale" quantities of drugs on the island. Sentencing is scheduled for December and some face up to 20 years.