Jordan Peterson discusses ideological possession in one video which kind of set off a whole train of thoughts in me starting from Howard Bloom with the issue "social memes".
It certainly seems related to what Rav Nahman talks about with "Torah scholars that are demons" [LeM vol I ch.s 12, 28.] meaning "possessed" I guess.
Furthermore what does one do if let's say he or she is "possessed"?
My thought about this is the idea of Rav Nahman of "hitbodadut" which means going to a place where no one else is around and talking with God as one talks with a friend. That I think is the way Rav Nahman is thinking that it is possible to get to one's inner core or the authentic you, and shed all the layers of false ideologies that one has picked up from other people.
[Besides that, Rav Nahman has advice for every possible problem in the Sefer HaMidot. I just do not recall what he says that would help for this problem.]