By DAVID KLEPPER WASHINGTON (AP) — A federal investigation into Chinese government efforts to hack into U.S. telecommunications networks has revealed a “broad and significant” cyberespionage campaign aimed at stealing information from Americans who work in government and politics, the FBI said Wednesday. Hackers affiliated with Beijing have compromised the networks of “multiple” telecommunications companies to obtain customer call records and gain access to the private communications of “a limited number of individuals,” according to a joint statement issued by the FBI and the federal Cybersecurity and Infrastructure Security Agency. The FBI did not identify any of the individuals targeted by the hackers but said most of them “are primarily involved in government or political activity.” The hackers also sought to copy “certain information that was subject to U.S.