I was reading Robert K. Massie's fantastic book, "Peter the Great" and I came across this passage:

Although public torture and execution were no novelty to any seventeenth-century European, what struck most visitors to Russia was the stoicism, “the unconquerable stubbornness” with which most Russians accepted these terrible agonies. They steadfastly resisted hideous pain, refusing to betray friends, and when condemned to death they went meekly and calmly to the gallows or block. An observer in Astrachan saw thirty rebels beheaded in less than half an hour. There was no noise or clamor. The condemned men simply went to the block and laid their heads in the pools of blood left by their predecessors. None even had his hands tied behind him. This incredible hardiness and unconquerable endurance of pain astonished not only foreigners but also Peter himself. Once, after a man had been tortured four times by knout and fire, Peter approached him in sheer wonder and asked how he could stand such great pain. The man was happy to talk about it and revealed to Peter the existence of a torture society of which he was a member. He explained that nobody was admitted without first being tortured, and that thereafter promotion within the society rested on being able to accept higher grades of torture.

What is known about these societies? Were they common? Why were they founded? How did they operate? Any information would be great.