..Authorities in Imperial County said Tuesday they will not press charges against two activists who swam across the All-American Canal to protest the drowning deaths of hundreds of illegal immigrants in the waterway. John Hunter, the brother of a prominent former congressman, and John Carlos Frey, a Los Angeles filmmaker, were facing charges of illegally entering the All-American Canal in an act of civil disobedience. Last month, the two men swam across the canal, which carries water from the Colorado River to San Diego County, to string safety buoys that illegal immigrants could use to cross the water safely... Authorities...