From SFWiki

Frank Chu (born March 24, 1960) can be found at nearly any major event in San Francisco carrying his sign in protest. Exactly what he is protesting changes from day to do and includes corporations, politicians, less clear items like "Colgrove", but the 12 Galaxies is always on his sign.

The 12 Galaxies music venue in The Mission was named in honor for him. There is a large number of photos tagged Frank Chu on Flickr.