Two Chinese immigrants in different parts of the country were charged in separate cases of espionage today, the Associated Press reports. One of them was based here:In Los Angeles, former Boeing engineer "Greg'' Chung was arrested on charges of working as an unregistered agent for the Chinese government who stole trade secrets from the defense contractor. Prosecutors say the stolen data largely focused on aerospace programs. Chung, a naturalized U.S. citizen, was indicted last week......