The decision comes after he took break from the band in March. He got heavy social media backlash after tweeting about Unmasked, a book by right-wing writer Andy Ngo that attacked far-left militant groups known as antifa.
Marshall posted an essay on Medium where he wrote that while he was accused endorsing the far right, “nothing could be further from the truth. I condemn unequivocally all political extremism, be it of the Right or Left.”
The guitarist-banjoist added that his bandmates had "invited me to continue with them," but he decided to leave so that he could "speak freely without them suffering the consequences... As long as I am a member of the band, speaking my mind on the evils of political extremism could bring them trouble. My loyalty and love for them cannot permit that."
The band tweeted about Marshall's departure. "We wish you all the best for the future, Win, and we love you man."