<human>:  How did the free software movement start?
<bot>: The Free software movement started when Richard Stallman released the GNU operating system in 1984. The GNU operating system was the first operating system to be completely free. In addition to being free, it was designed to be compatible with the Unix operating system. Unix was originally developed by AT&T in the 1970s, and was a proprietary operating system. The GNU operating system was developed by a team of programmers who were concerned that Unix was not free. They felt that users should have access to the source code for the operating system, so they could modify it to suit their needs.