FILE - In this Feb. 18, 2014 file photo, opposition leader Leopoldo Lopez, dressed in white and holding up a flower stem, is taken into custody by Bolivarian National Guards, in Caracas, Venezuela. From Mexico to Brazil, leaders in Latin America have been largely silent in the face of a growing crackdown on dissent in Venezuela and are unlikely to speak out against their neighbor at the upcoming Summit of the Americas on April 10, 2015, in Panama. (AP Photo/Alejandro Cegarra, FIle)
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