About six years ago, when I began to investigate the suspicions described in this book, I had no idea that, accidentally digging into the depths, I would stumble upon traces of such a large case. Then I really did not want to start this thankless work. I subconsciously felt what a heavy burden I was taking on myself, and looked for ways to avoid it in any way. However, the events themselves developed in such a way that they deprived me of the opportunity to evade responsibility, again and again, against my will, forcing me to continue the investigation.