The Federation exists to "ensure Jewish survival and enhance the quality of Jewish life locally, in Israel and worldwide."
Large weapon and ammo buy would be a start. Then set up a shooting range and use it. A lot.
My wife worked at the Jewish Federation of Greater Seattle up to four years ago.
When my daughter turned 6, we held a water-party in the backyard with a pool, sprinklers, squirt guns, water balloons, etc. Many Jewish kids from the neighborhood and our local Jewish day school attended.
Not one mother let their child go home with their brightly colored squirt gun, because it was shaped like a gun.
Now that I'm in North Dakota, I'm armed to the teeth, and my daughter knows how to use the guns. Any Muzzies want to take on the armed Jewish contingent up here will have to contend with me and my well armed Christian neighbors.