The politically outspoken rap-rock band's lead singer, Zach de la Rocha, plans to announce Wednesday (July 21) that proceeds from a concert in Los Angeles on Friday (July 23) will go to organizations fighting against Arizona's law.
De la Rocha, guitarist Tom Morello, singer-songwriter Conor Oberst  and United Farm Workers co-founder Dolores Huerta will also throw their support behind Sound Strike, an artists' boycott of Arizona.
Norteno superstars Los Tigres del Norte , Colombian rock singer Juanes , salsa-ska band Ozomatli  and Puerto Rican reggaeton duo Calle 13  have signed on, along with Sonic Youth , Kanye West  and Massive Attack .
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