Dozens of federal agents on Monday raided the Oakland businesses and apartment of Richard Lee, the state's most prominent advocate for the legalization and regulation of marijuana, carting away loads of pot and belongings but not revealing the purpose of their investigation.

The agents targeted Oaksterdam University, the internationally famous school that Lee established to train people in the marijuana industry, a medical cannabis dispensary called Coffeeshop Blue Sky, and three properties being rented by Lee, including his apartment near Lake Merritt.

The armed and sometimes masked agents from the U.S. Internal Revenue Service, the U.S. Drug Enforcement Agency and the U.S. Marshals Service came with a battering ram, a sledgehammer, power saws and a locksmith.

On its website, Oaksterdam University bills itself as "quality training for the cannibus industry."

Read the full San Francisco Chronicle story.