Short story: My Failed Indoctrination

I remember when I was a kid at Hebrew school, I had one teacher, a young rabbi, who had worked for a few years rescuing kids who had been brainwashed by cults. Kids who would disappear, leaving their family to join some religious sect, these rabbis would answer the call of their parents like the A-Team but with beards and black overcoats. They would track the kids down and kidnap them if they had too, then spend days, or even months if necessary (although I doubt that was really necessary too...