I'm looking for some historical info on Russian intelligence services during the second world war for a piece of historical fiction I'm dabbling with. I know the OSS (Office of Strategic Services) contributed much to the present day CIA and British Intelligence services, but I'm going to assume that the Russian KGB of the Cold War didn't just magically appear one night. I assume that it started with intel roots somewhere and I honestly don't even know what to search for in the case of Russian intelligence operations against the Germans in World War II. I don't even know what it would have been or might have been called, since I don't speak Russian. Any suggestions on a starting place to begin such research for the historical precursor to the Cold War KGB era?