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.

Based on that paragraph can we conclude that this sentence is true?
Students have joined the International Socialist Workers Party

Options are:
[A]. Yes
[B]. It's impossible to say
[C]. No
[A].