(S (S (NP (BASENP (DT A) (JJ collective) (NN group)) (PP (IN of) (NP (BASENP (NN graffiti) (NNS artists)) (CC and) (BASENP (NN street) (NNS artists))))) (VP (VBP are) (VP (ADVP (RB now)) (VP (VP (VBG banding) (ADVP (RB together))) (COMMA ,) (S (VP (VBG vandalizing) (BASENP (DT the) (JJ look-alike) (NN graffiti) (NNS advertisements)))))))) (PERIOD .))