Aiming to give a voice to the thousands of Jews in NYC who refuse to let the right-wingers speak for them, JFREJ is a community group that seeks influence both within and outside of its community. It educates young members, but also seeks collaborations with local LGBT and neighborhood groups to pursue social and economic justice issues. For an interesting take on holidays: How about the activist tashlich? Or is anti-prisons Passover more your style? These are actual events, so call to volunteer if you're interested.