Oakland, Calif. police push back demonstrators trying to prevent the departure of federal law enforcement after a coordinated raid on Oaksterdam University, Monday, April 2, 2012 in Oakland. Agents from the Drug Enforcement Agency and the Internal Revenue Service, backed up by members of the U.S. Marshals, raided the marijuana cultivation school and seized boxes of documents and dozens of bags filled with marijuana plants. (D. Ross Cameron/Staff Archives)
