The film is about an advanced American defense system, named Colossus, becoming sentient. After being handed full control, Colossus' draconian logic expands on its original nuclear defense directives to assume total control of the world...

https://en.wikipedia.org/wiki/Colossus:_The_Forbin_Project

movie links:

• vimeo: https://vimeo.com/584593423
• archive: https://archive.org/details/colossus-the-forbin-project-1970