This 1971 movie was about 20 years ahead of it's time in terms of computers and their use/misuse. It really predicted computer fraud, fake identities, hacking, sabotage of hardware systems like elevators and more. The people who wrote it were highly intelligent educated and experts in the computer field who had real vision.
It also starred James Olson, who started in another technology thriller, 'The Andromeda Strain'.
When. Peoeple talk of SF predicting the future, they need to talk about this movie.
Here' s some in detpth reviews some with spoilers. This made for tv movie is apparently available online free and I recommend it. Dean Stock well. Makes an excellent for the creepy intellectual archetype.
https://www.imdb.com/title/tt0067551/reviews