their often heartbreaking testimony , spoken directly into director patricio guzman 's camera , pack a powerful emotional wallop 
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(ROOT (S (NP (NP (PRP$ ) (ADJP (RB ) (JJ )) (NN )) (, ) (VP (VBN ) (PP (ADVP (RB )) (IN ) (NP (NP (NN ) (NNP ) (NNP ) (POS )) (NN )))) (, )) (VP (VB ) (NP (DT ) (JJ ) (JJ ) (NN )))))