Doctors' plot
The Kingdom of Israel (, "Malchut Yisrael"), or Tzrifin Underground, was a Jewish terrorist group active in Israel in the 1950s. "Kingdom of Israel" was the name that the group's members used, but it was better known to the Israeli public as the "Tzrifin Underground", after the Tzrifin military base, where its members were put on trial. The group carried out attacks on the diplomatic missions of the Soviet Union and Czechoslovakia in protest against those countries' anti-Semitic policies, such as the Slánský trial and the Doctors' plot. They also attempted to assassinate German Chancellor Konrad Adenauer with letter bombs, and occasionally shot at Jordanian troops stationed along the border in Jerusalem.