(S (S (PP (IN In) (NP (DT a) (NP (NP (BASENP (NNP Voice)) (PP (IN of) (BASENP (NNP America)))) (NN interview)))) (S (SBAR (ADVP (RB shortly)) (SBAR (IN before) (S (BASENP (PRP he)) (VP (VBD was) (VP (VBN poisoned) (PP (IN by) (BASENP (DT a) (JJ radioactive) (NN substance) (NN polonium-210)))))))) (COMMA ,) (S (BASENP (JJ former) (JJ Russian) (NN spy) (NNP Litvinenko)) (VP (VBD had) (VP (VP (VBN accused) (BASENP (NNP Putin))) (PP (IN of) (S (VP (VP (VBG ordering) (NP (BASENP (DT the) (NN murder)) (PP (IN of) (BASENP (JJ Russian) (NN journalist) (NNP Anna) (NNP Politkovskaya))))) (S (VP (TO to) (VP (VP (VB silence) (BASENP (PRP her))) (CC and) (VP (VB intimidate) (BASENP (JJ other) (JJ independent) (NNS journalists)))))))))))))) (PERIOD .))