Billie Joe Armstrong, Duff McKagan and members of Against Me! are among those who signed an open letter asking for intervention in the Standing Rock protest.
Green Day's Billie Joe Armstrong is not a fan of cell phones at shows, wishing for a more human experience. He's also spoken on the Trump election aftermath.
Green Day frontman has always voiced his political opinion, this time expressing how social progress has taken a hit with Donald Trump as President-elect.