In 2010 a committee of four history professors from the universities of Cologne, Marburg, the Technical University of Dresden and Humboldt University of Berlin was commissioned to spend four years studying the history of Germany’s Bundesnachrichtendienst foreign intelligence service, originally assembled under the head of the post-Nazi German army Reinhard Gehlen by the Allies in 1945 in a hurry for Cold War purposes. This committee’s results will be published under “Reports by the Research and Work Group ‘History of the BND’” (MFGBND).
There are probably other issues, but the initial haste that led to many former Nazis and worse being hired and given new identities by the Gehlen organization that became the BND ultimately became a security weakness when at least one former SS officer was blackmailed for his nazi past into turning into a double agent by the KGB. A CIA report, fwiw, from the early 1950’s estimated that the BND contained around 25% former Nazis, and it said a similar percentage had been voted into the second Bundestag. Good thing the former Nazis’ children started posing hard questions in ~1968.