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U.S. marshals stand at the entrance of Oaksterdam University in Oakland, Calif., on Monday, April 2, 2012. The federal agents raided the medical marijuana training school at the heart of California's pot legalization movement. (AP Photo/Noah Berger)

Marijuana crackdown stirs protests

Hundreds of medical marijuana activists gathered on the steps of City Hall Apr. 3 to support California's multi-million dollar cannabis industry, under siege since the federal government launched an aggressive crackdown last fall.