Kinder garden.
When as a child, I expressed an interest in joining the Boy Scouts, my mother quickly put the kabosh on it. "No child of mine is going to march around in a uniform, saluting and waving flags like some little Hitler Youth." At the time, I was very disappointed; now, I think it worked out for the best.
As a young adult, I came to the same conclusion about college fraternities without any help from her. No matter how benign the organizers of these groups may be, their ultimate purpose is to inculcate values by the use of group peer pressure.