Surely the member would admit that we should not prejudge the inquiry and that there were some students or even non-students who were members of groups such as the International Socialist Workers Party and other radical organizations who were clearly there to disrupt the summit, posing a security threat and tearing down a security wall separating them from heads of states.
Some people attended the event in order to cause problems. 
( z1 attend :ARG0 ( z2 person :mod ( z3 some ) ) :ARG1 ( z4 event ) :purpose ( z5 cause :ARG0 z2 :ARG1 ( z6 problem ) ) )