Frankly, there is no mention of Sanders in this article, so those who claim that am this is being carried out by Sander's supporters are misrepresenting reality. Likewise, for the group to claim that they are trying to call out "leftist radicals" is presupposing that the protestors are either leftist and/or radicals, which is an assumption at best.

This article to me reads: Trump supporters plan meeting that is interrupted by non-Trump supporters. In fact, that one sentence summarizes the whole event. I would have liked to have heard about the policy debates in more detail, or the positions that each group was discussing. Instead, this is just an announcement of likely vitriol. 

This article is rather dumb in my opinion, as are the comments from individuals who are over generalizing.