Poke any notable Soviet science and technology figure and see if they have KGB in their biography.
Soviet R&D wasn't structured within end users but was own network of research institutes and design bureaus. So if you wanted to work say on solid state rockets you wouldn't go to artillery school but rather something like Central Scientific Research Institute of Heat and Mass Exchange. There you'd be working for tactical rocket stuffings for the rest of your life, have a certain academic career track and as a perk have an occasional international publication with peripheral results.
Being investigated by KGB is so categorically different thing than being a KGB officer that I'm not even sure where to start.
But sure: Sergei Korolev, the champion of Soviet space programe had his jaw permanently broken in one of NKVD/KGB torture sessions. This later led to his untimely demise.
