Last month they took on Sheriff Joe Arpaio and the record industry in a pair of new songs, but Conor Oberst and his reunited Desaparecidos aren’t done chiming in on timely controversies just yet: “Anonymous” is the latest cut to surface since their 2002 debut, complete with a rallying call (“You can’t stop us!”) behind WikiLeaks and the — you guessed it — Anonymous movement. Donning ’60s protest-era military garb and some long, Lieutenant Dan-style hair, Oberst introduced the song last week by citing the imprisonment of alleged classified document leaker Private Bradley Manning before the punk outfit marched aboard the soap box with fervor. It’s hard to make out all the lyrics, but this shaky glimpse from their FYF Fest set caught the energy of the moment quite well. *Update: A studio version of “Anonymous” and new song “The Left is Right” are now streaming above.