Does Anyone Know of any NGO's or IR related offices hiring in NYC?

I've been searching since I graduated in May for a position in IR in advocacy, lobbying, or with a UN Office. I've been to idealist, and the UN job site, but no luck. I've heard most jobs aren't even advertised but spread via word of mouth. I have a BA in Poli. Sci. and am very interested in working with the UN, but most of the "fun" jobs required a M.A. Are there any positions only require a BA?