Former NSA technical director and whistleblower Bill Binney will be hosting an AMA on r/wayofthebern. Bill developed a program known as ThinThread which would utilized inductive/deductive/adductive approaches which would have monitored people for criminal activities under Constitutional grounds.

https://www.reddit.com/r/privacy/comments/iie71g/former_nsa_technical_director_and_whistleblower/

https://www.reddit.com/r/politics/comments/iie2sc/bill_binney_will_be_doing_hosting_an_ama_on/?