Maybe "control" was the wrong word.
First year, went to meetings at houses in my hometown, where we'd discuss the bible and maybe listen to a tape from the group leader or elsewhere.
Then, moved to Amish country (Pennsylvania) and lived in a few different houses ("fellowships") with a small number of other members for a year or so.
Then moved to NYC for 'training" (since the initial shine had pretty much worn off). It wasn't overt brainwashing, but there was definite peer pressure and control by leveraging our desire to belong and the "be faithful to Jesus".
The group leader was convinced that he would spread the gospel thru the USA, and that he had the "key" to scriptural interpretation.
(I've done quite a bit of reading about the methods used by other groups around that time, and there were quite a few. Still are, actually. Scientology is probably the most well-known. What I experienced wasn't the same. I had internal curiosity and a desire to better myself. There was also the social aspect which I wanted, to a degree).
So, it was pretty much the plain-vanilla brand of guilt and shaming that was used and is used in mainstream churches to this day.
The dynamic was to make us feel guilty for not being "X" enough. (Zealous, faithful, whatever the theme of the month happened to be).
But there was definitely a change-up - the carrot-and-stick approach. Some sessions would be about some interpretation about the parables or the figurative prophecies in Daniel or Revelations. (This has much precedent - here's an example)
https://www.amazon.com/Course-Lectures-Figurative-Language-Scripture/dp/0353931403
And sometimes guests from other churches or groups would stop in. These were interesting and enlightening.
But we also spent a lot of time staring at the floor while listening to monologues and being brow-beaten about something or other. Basically, just not good enough, and need-to-be-better. etc.
After awhile, I realized that I'd had enough, and it wasn't helping me. It was a gradual drifting away, but with residual guilt and anxiety for quite a long time afterwards....
And later I needed to break contact with my friends, who, although out themselves, would just rehash old stories and grievances that would wear me down.
I feel somewhat isolated now, in the sense that they would have been my "college friends" if I'd followed the normal life trajectory, but I didn't....