(S (S (BASENP (DT The) (NN group) (NNP Amnesty) (NNP International) (NNP USA)) (VP (VBZ is) (VP (VBG calling) (SBAR (IN for) (S (BASENP (DT the) (NNP US) (NNP Congress)) (VP (TO to) (VP (VB create) (NP (BASENP (DT a) (NN commission)) (SBAR (S (VP (TO to) (VP (VB investigate) (NP (BASENP (NN detention) (CC and) (NN interrogation)) (NNS practices)))))))))))))) (PERIOD .))