Well, also the leakage of nearly all information on everyone with a clearance: https://www.businessinsider.com/cia-spies-in-china-may-have-had-cover-blown-from

Well, also the leakage of nearly all information on everyone with a clearance: https://www.businessinsider.com/cia-spies-in-china-may-have-had-cover-blown-from-opm-hack-2015-7 https://www.businessinsider.com/cia-spies-in-china-may-have-... Edit: You may have heard that the CIA did not trust OPM, but, once you have a list of everyone with a clearance that is in the OPM databases, you have good grounds for assuming anyone missing, who should have a clearance, is a spy.