He has done much for the movement and this isn't meant to denigrate him. It's just that there was free software proponents before him and he's just the famous one. I'm sure Wikipedia has an article on the history of free software. It should go back at least as far as SHARE, from the 1950s, as I recall.
Again, this isn't meant to denigrate RMS, or his work. He's a nice enough fellow. In fact, we went to school together. This is just a bit of a lead for those who wish to look deeper.
Actually, I'll get you a link.