Rand Paul Seeks to De-Fund the United Nations

The folks at Think Progress are all up in arms over a Rand Paul sponsored amendment which seems to want to cut UN funding from the federal budget (it doesn't say so explicitly but it cuts the exact amount that the UN gets from us).  I really applaud the move, can someone please tell me what we get from the UN?  What tangible benefit do we see from giving billions every year to an anti-American organization that is run by African and Asian despots?  When it started, it was mostly populated by democracies but now, dictatorships and other banana republics hold sway so what's the point?  We should be giving them none of our funding or our sovereignty.