I am not trying to brag but most of us old timers, ie before internet, either had no knowledge or we found books that gave us information, some of us were lucky enough to be discovered by a larger group and got to the attend munches and parties, find mentors and partners. Here in my area it was very very hidden from everyone because of social fear and a real fear of the law.
The local groups provided knowledge and protection for the subbies too. When one was hurt badly by a poser we took care of the poser, and put out the word so that he or she was forced to find victims from the general population.
One of my points that I expected some one to pick up on was that the greatest of all Masters would also be a Dom do to the kind of care offered to the sub/slave and that the Master during a scene was Topping.