These people should prepare for violence by arming themselves-looking around for help is pitiful.This is not likely because these people are probably in favor of gun control.I like it that the true source of hatred is being exposed -leftist foreign students and their like-minded American fellow travelers.I'm not advocating offensive violence-simply that if you have a clubhouse like Hillel probably does they should be prepared to be attacked-and if they are they have every right to take care of business-they undoubtedly would be outnumbered and that is justification enough to use whatever means are available.
The little disposable cameras that you can buy for a couple of dollars are handy. When thugs behave this way, a dozen or so in the threatened group should whip 'em out and document the thugs...so action can be taken later. Post 'em on the internet. Research and id them and post that. Deprive them of anonimity.
And if the thugs object and attack, then you can shoot them.