“I feel that it is now necessary to leave Rage because our decision-making process has completely failed,” the singer said in a statement. “It is no longer meeting the aspirations of all four of us collectively as a band, and from my perspective, has undermined our artistic and political ideal. I am extremely proud of our work, both as activists and musicians, as well as indebted and grateful to every person who has expressed solidarity and shared this incredible experience with us.”

No further information on his decision or the fate of the band was immediately available.

RATM formed in Los Angeles in 1991 and honed their formidable live show before signing with Epic Records, which issued three albums from Rage, including 1999’s Battle Of Los Angeles.

An Epic spokesman would not comment on plans to release a live album recorded at two Los Angeles shows last month. De La Rocha is reportedly working on a solo album and his career as an artist appears secure.

Since their first gig in a friend’s living room, RATM spent far more time on the road spreading their politically charged message than in the studio. By the mid-‘90s, the endless tour itinerary was wearing on the band and rumors of a breakup began circulating.

Obviously, the foursome decided against splitting at that time but internal turmoil continued to dog the group. This year was especially hard on the band. The cancellation of the Rhyme & Reason tour with the Beastie Boys was a major disappointment and other on-again, off-again gig plans signaled some discontent within the group.

The rift became more obvious in September when bassist Timothy Commerford was arrested at the MTV Video Music Awards after climbing a stage prop, an act roundly criticized by his bandmates and fans.

RATM’s future was further clouded by their recent split with their management company.

The band had no tour plans at the time of De La Rocha’s announcement and has made no mention of it on their official Web site.