(S (S (BASENP (DT These)) (VP (ADVP (RB usually)) (VP (VBD involved) (NP (BASENP (NNS clashes)) (PP (PP (IN between) (BASENP (ADJP (JJ left) (CC and) (JJ right)) (NNS extremists))) (CONJP (RB rather) (IN than)) (PP (IN with) (BASENP (NNS authorities)))))))) (PERIOD .))