| http://www.w3.org/ns/prov#value | - Allison Joyce/Getty Images(NEW YORK) -- Thousands of people across the country are expected to participate in rallies demanding justice for slain teenager Trayvon Martin on Saturday.George Zimmerman, the volunteer neighborhood watch captain who claimed he shot Martin in self defense on Feb. 26, has been in hiding ever since demands for his arrest and threats against his life, including a $10,000 b
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