Google tightened security by banning contractors and temp workers from its internal Groups forums, a

Last April, Google's contract, vendor, and temporary workers — known as TVCs — were barred from all internal chat forums running on the company's Google Groups software, former TVCs told Business Insider.  The company cited security concerns as the reason for locking TVCs out of the Google Groups forums — a former TVC told us.  The decision had a "chilling effect" on the contractor community across Google, isolating them from their full-time counterparts and holding them back from being able...