"We've seen some examples where groups have tried to prevent forums taking place, and I think what we have to ensure is that where that is happening, there is an ability - especially on our university campuses - for those events to go ahead," Mr Tehan told Fairfax Media on Friday. "We want to make sure that there are procedures and structures in place that mean events can occur ... and not be put in jeopardy because of increased security costs. "It might well be those people who seek to disrupt [who] might have to end up bearing some of the responsibility of the financial cost. It should not be based solely on those who want to run events [having to pay]." Mr Tehan acknowledged the Sydney University event ultimately went ahead as planned, but said the problem was becoming more frequent and should be dealt with right away. But the vice-chancellors told Mr Tehan they already have measures to protect free speech on campus. "They said they have policies in place, they’ve agreed to provide me with those policies," Mr Tehan told Fairfax Media.

Sydney University vice-chancellor Michael Spence was unable to attend the meeting with Mr Tehan. But in a statement, a university spokeswoman said: "We'd be interested to hear any suggestions the minister has in practice for charging a crowd of protesters, only some of whom may be members of the university." The Sydney University Liberal Club was charged $475 for security for the event. But it never had to foot the bill - it was paid by Victorian Liberal Party president Michael Kroger, who cut a cheque for $5000 to cover all the event's costs. Loading Asked how to enforce a "you protest, you pay" policy, SULC president Jack O'Brien said one could "identify key protesters and the key organisations that ran the protest", and send them the bill. "We want to see a bit of action on this," Mr O'Brien said on Friday. "It's a bit disgraceful."