Eric Hughes co-founded the Cypherpunks mailing list, which began in September 1992. On 9 March 1993 he wrote A Cypherpunk's Manifesto. Its core line: "Privacy is necessary for an open society in the electronic age."
The manifesto also says cypherpunks write code and publish it freely. Bitcoin follows that path as open-source software.
Takeaway: Bitcoin's focus on privacy and open code goes back to this movement.