The name Neturei Karta literally means “Guardians of the City” in Aramaic and comes from the gemara of the Jerusalem Talmud, Hagigah, 76c. There it is related that Rabbi Judah haNasi sent two rabbis on a tour of inspection:
In one town they asked to see the “guardians of the city” and the city guard was paraded before them. They said that these were not the guardians of the city but its destroyers, which prompted the citizens to ask who, then, could be considered the guardians. The rabbis answered, “The scribes and the scholars,” referring them to Tehillim (Psalms) Chapter 127.[6]
Wikipedia article on “Neturei Karta”