From the NK wiki:
http://en.wikipedia.org/wiki/Neturei_kartaNeturei Karta (Jewish Babylonian Aramaic: נטורי קרתא nāṭūrī qarṯā, literally "Guardians of the City") is a Jewish sect, formally created in Jerusalem, British Mandate of Palestine, in 1938, splitting off from Agudas Yisrael. Neturei Karta opposes Zionism and calls for a peaceful dismantling of the State of Israel, in the belief that Jews are forbidden to have their own state until the coming of the Jewish Messiah.[1][2] They live as a part of larger Haredi communities around the globe.
In Israel some members also pray at affiliated beit midrash, in Jerusalem's Meah Shearim neighborhood and in Ramat Beit Shemesh Bet. Neturei Karta states that no official count of the number of members exists.[3] The Jewish Virtual Library puts their numbers at 5,000 in Jerusalem[4] The Anti-Defamation League estimates that fewer than 100 members of the community take part in anti-Israel activism.[5]
According to Neturei Karta:
"The name Neturei Karta is a name usually given to those people who regularly pray in the Neturei Karta synagogues (Torah Ve'Yirah Jerusalem, Torah U'Tefillah London, Torah U'Tefillah NY, Beis Yehudi Upstate NY, etc.), study in or send their children to educational institutions run by Neturei Karta, or actively participate in activities, assemblies or demonstrations called by the Neturei Karta".[6]