look back at civil disobedience , anti-war movements and the power of strong voices . 
(ROOT (S (VP (VB look) (ADVP (RB back)) (PP (IN at) (NP (NP (JJ civil) (NN disobedience)) (, ,) (NP (JJ anti-war) (NNS movements)) (CC and) (NP (NP (DT the) (NN power)) (PP (IN of) (NP (JJ strong) (NNS voices))))))) (. .)))
(ROOT (S (VP (VB ) (ADVP (RB )) (PP (IN ) (NP (NP (JJ ) (NN )) (, ) (NP (JJ ) (NNS )) (CC ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (JJ ) (NNS ))))))) (. )))