Adam Baldwin also linked hashtag #GamerGate to the anti-feminism movement[1] when "when tweeting links to pre-existing misogynistic corruption conspiracy theory videos surrounding Quinn and Sarkeesian".
Maybe it meant something else for a week or two. But it's been associated with this for much longer than anything else.
[1] https://twitter.com/AdamBaldwin/status/504801169638567936
[2] http://arstechnica.com/gaming/2014/09/new-chat-logs-show-how...