Robert Lifton has 8 criteria for Thought Reform based on his research into brainwashing and prisoners of war.
I've listed them here: www.mumsnet.com/Talk/womens_rights/4382551-Live-not-by-lies-Solzhenitsyn-no-tambourines-involved?msgid=111900052
3 of the interesting ones for this discussion are:
Sacred Science. The group's doctrine or ideology is considered to be the ultimate Truth, beyond all questioning or dispute. Truth is not to be found outside the group. The leader, as the spokesperson for God or all humanity, is likewise above criticism.
Loading the Language. The group interprets or uses words and phrases in new ways so that often the outside world does not understand. This jargon consists of thought-terminating clichés, which serve to alter members' thought processes to conform to the group's way of thinking.
Dispensing of existence. The group has the prerogative to decide who has the right to exist and who does not. This is usually not literal but means that those in the outside world are not saved, unenlightened, unconscious, and must be converted to the group's ideology. If they do not join the group or are critical of the group, then they must be rejected by the members. Thus, the outside world loses all credibility. In conjunction, should any member leave the group, he or she must be rejected also.
The language is being changed around us and it's making it fraught to have conversations in some contexts or to scrutinise policies and legislation. Look at the government's recent refusal to record biological sex because 'nobody knows how to assess sex and biological sex doesn't exist'. 
www.mumsnet.com/Talk/womens_rights/4382975-Trans-Criminals-are-not-Women-says-Priti-Patel?msgid=111908344
How often are we told that belief in the immutability of sex is evidence of bigotry and younger people don't have our restricted thinking and this will all become clearer as those of us with these arcane wrongthink patterns die out?