After years of evidence that the FBI has abused its spy authorities, Congress is embarking on a bipartisan effort to revamp a key surveillance law to better protect civil liberties, including appointing special lawyers to advocate on behalf of Americans secretly targeted by the government.The Foreign Intelligence Surveillance Act Section 702 powers allow the government to rummage through phone records in terrorism and counterintelligence probes without a warrant and have long raised deep concerns, starting with ACLU litigation years ago and co …