Speakers at past Socialism conferences include filmmaker and author Tariq Ali , actors Wallace Shawn and John Cusack , `` The Nation `` writers Jeremy Scahill and Dave Zirin , journalists Amy Goodman , Glenn Greenwald , scholar Keeanga-Yamahtta Taylor , environmental writer John Bellamy Foster , science-fiction author China Miéville , Iraq Veterans Against the War member Camilo Mejía , Palestinian rights activists Omar Barghouti and Ali Abunimah .
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