FOUND IT! The flower garden reference

Mr Antonov-Ovseyenko said: "Sometimes he would have his henchmen bring five, six or seven girls to him. He would make them strip, except for their shoes, and then force them into a circle on their hands and knees with their heads together.

"He would walk around in his dressing gown inspecting them. Then he would pull one out by her leg and haul her off to rape her. He called it the flower game."

https://www.telegraph.co.uk/news/worldnews/europe/russia/1450145/Stalins-depraved-executioner-still-has-grip-on-Moscow.html