Federal prosecutors have filed civil forfeiture actions against an Oakland medical marijuana dispensary that bills itself as the world's largest, as part of a crackdown by U.S. authorities on California's massive cannabis trade. The lawsuits seek forfeiture of two properties where Harborside Health Center operates, said the U.S. attorney for the Northern District of California. Harborside says it is the largest medical marijuana dispensary in the world, serving more than 100,000 patients and is subject of the Discovery Channel reality TV show Weed Wars.