SAN FRANCISCO (AP) - A string of antique stores were busted Thursday for allegedly hiring dozens of illegal immigrants, selling fake pieces and engaging in the black market ivory trade, federal authorities said. During searches of 11 locations, agents arrested 29 foreign nationals from Israel, Mexico, China and South America on immigration violations, said Virginia Kice, spokeswoman for U.S. Immigration and Customs Enforcement. The investigation involved more than 150 agents from ICE, Federal Bureau of Investigation, Internal Revenue Service and U.S. Fish and Wildlife Service, which was looking into whether the businesses illegally imported and sold ivory and ivory products....