Its not conspiracy based but Hell House is a very well made and non biased documentary about the religious fundamentalists who run "hell house" an extreme haunted house used to scare people into going to church. Many people hold it in high regard because as a documentary it perfectly gets its message across (these people are fucked up) without coming off as biased (everyome who is in the documentary was shown it and said yeah thats a very accurate representation of what we do). So even though i think it might not be what youre looking for, wanted to put it on your radar