Ehhhhhhhhhh… That's not really the main thing they support. FSF supports software freedom. They also support software freedom. So they support FSF. It's not that they support FSF and therefore support software freedom.

I do occasionally call them "FSF fans" as opposed to "OSI fans" but… Eh, I dunno, the organization that represents software freedom isn't as important. We just don't have any others that aren't othwr branches of FSF like FSFE and FSFLA. Also maybe EFF but software freedom isn't EFF's main concern. So technically they are GNU/FSF/FSFE/FSFLA/SFC/SFLC/Mozilla/Tor/EFF supporters. But that's a mouthful.