(S (S (NP (BASENP (DT The) (NN study)) (PRN (COMMA ,) (PP (VBN based) (PP (IN upon) (NP (NP (BASENP (NNS interviews)) (PP (IN with) (NP (BASENP (NNS hundreds)) (PP (IN of) (NP (NP (NP (NP (BASENP (NNS managers)) (COMMA ,) (BASENP (NNS activists))) (COMMA ,) (BASENP (NN government) (NNS officials))) (COMMA ,) (BASENP (NN factory) (NNS workers))) (CC and) (BASENP (NN worker) (NNS representatives))))))) (CC and) (NP (BASENP (NNS visits)) (PP (TO to) (NP (BASENP (NNS companies)) (PP (ADVP (RB all)) (PP (IN over) (BASENP (DT the) (NN world)))))))))) (COMMA ,))) (VP (VP (VBZ goes) (PRT (RP on))) (S (VP (TO to) (VP (VB suggest) (SBAR (IN that) (S (BASENP (NNS workers)) (VP (MD should) (VP (VB be) (VP (VBN given) (NP (BASENP (JJR more) (NNS powers)) (S (VP (TO to) (VP (VB oversee) (NP (BASENP (NNS conditions)) (PP (IN in) (NP (BASENP (PRPD their) (NNS places)) (PP (IN of) (BASENP (NN work)))))))))))))))))))) (PERIOD .))