(S (S (NP (NP (NP (BASENP (DT The) (NNP Communication) (NNPS Workers) (POS ')) (NNP Union)) (PRN (LRB -LRB-) (BASENP (NNP CWU)) (RRB -RRB-))) (COMMA ,) (SBAR (WHNP (WDT that)) (S (VP (VBZ represents) (NP (BASENP (NNS employees)) (PP (IN of) (BASENP (DT the) (JJ postal) (NN service)))))))) (VP (VP (VBD balloted) (NP (BASENP (NNS members)) (PP (IN on) (BASENP (JJ nationwide) (NN strike) (NN action))))) (COMMA ,) (PP (VBG following) (NP (NP (BASENP (DT a) (NN series)) (PP (IN of) (BASENP (JJ regional) (NNS strikes)))) (PP (IN over) (BASENP (DT the) (JJ past) (NN 3) (NNS weeks))))))) (PERIOD .))