Performing under the moniker of the Nightwatchman, Rage Against the Machine guitarist Tom Morello debuted a brand new -- and politically charged -- song over the weekend. Called 'Marching On Ferguson,' Morello, along with a three-piece band, performed the tune at 'Jail Guitar Doors Rock Out 2!' at the Ford Theatres in Hollywood, Calif. on Sept. 5.

'Jail Guitar Doors' is a fundraising event named after the Clash's 1978 song of the same name. According to the benefit's website, "In 2007, to honor the life of Clash founder, Joe Strummer, Billy Bragg [launched] an initiative in England to provide musical equipment used to rehabilitate inmates serving time in Her Majesty’s Prisons in the United Kingdom." It didn't take long for the event to migrate stateside, and this year's edition featured Jackson Browne, Ben Harper and more alongside Morello.

Never one to shy away from speaking his mind, it's not surprising Morello penned a protest song supporting Ferguson, Mo. On Aug. 9, Michael Brown was shot to death in the streets of Ferguson, and since then, the country has been focused on why it happened. In the short tune, Morello jams a wicked guitar riff with a simple, yet meaningful chorus: "I'm marching on Ferguson / I'm marching tonight." Watch his performance of the new song in the video above.

Morello will be featured on the upcoming 'This Concerns Everyone' protest album set for release on Nov. 18. Get details on the LP here.