Of all the unanswered questions in the Bloch affair, one of the largest was how the investigation had been blown to the Soviets. Over a decade later, US authorities would discover that [[Robert Hanssen]], a corrupt FBI official, had been responsible for alerting the Soviets to the investigation. The investigation into the suspected mole had first led officials, however, to misguided suspicion of a CIA official, Brian Kelley.<ref>[http://www.washingtonpost.com/politics/veteran-counterspy-brian-kelley-who-broke-moscow-code-and-was-hounded-by-fbi-dies-at-68/2011/09/20/gIQAm55VjK_story.html Veteran counterspy Brian Kelley, who broke Moscow code and was hounded by FBI, dies at 68] publisher=[[The Washington Post]] |date=September 20, 2011</ref> Kelley was placed under surveillance for years and his CIA career was badly damaged. Investigators later became satisfied he had been completely innocent, and he only fell under suspicion because personal data about him fit a matrix that investigators felt they might be looking for in a mole.<ref>[http://www.indyweek.com/gyrobase/Content?oid=oid%3A20083 Independent Weekly: After the molehunts<!-- Bot generated title -->]</ref> Hanssen's downfall renewed speculation that Bloch would at last be charged; however, several years have elapsed since Hanssen's guilty plea and no further action against Bloch appears to be forthcoming.