Here's four. At the very least you can't deny 1 and 2.
https://en.m.wikipedia.org/wiki/The_Hole_(Scientology)
The Mormon one is not a stretch because many Mormons feel forced into missionary work at risk of being excommunicated from their family. My mothers side of the family is Mormon and it's a popular sentiment.
North Korea has internment camps for Christians where they manufacture products.
Josh Duggar's Christian rehab exploits it's patients for free labor.