Here are some examples which are, to the best of my knowledge, in order of oldest to newest and show a policy being enforced, or one formed from a trend, or perhaps more insidiously, from some kind of manual.
First, the Israeli ambassador to the US was shouted down, and his speech ended before it began at California Irvine.
Then, former Belgian leftist, who had seen the effects of Islam on all the things he actually cared about, changes his mind and was about to speak at a Norwegian university on Islam and the following happened, where the disrupters credited the students at Irvine of showing them the way:
Lastly, we have todays winner. In a highly calculated ploy to destroy anyone who would oppose Islamic primacy in Europe, Lars Vilks is shouted down and attacked at a university in Sweden. Lots of information here on Vlad if you want to scroll down a bit. I just felt that this is becoming sufficiently a calculated spreading pattern that it needs to be demonstrated as such, and as such, a counter strategy had better be deployed soon, if we wish to preserve any semblance of the things that gave humanity pretty much everything we have gained since the darkest most brutal and crushingly unfair points of our history.