Kingdom of Israel (group)

[1] 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.

[6][8] The sophistication of the bombing led Shin Bet head Isser Harel to believe that former Lehi members were responsible, but an intensive investigation failed to turn up the perpetrators.

[9][10] The Tzrifin Underground also attacked the Czechoslovak embassy three times, and sent two letter bombs to West German Chancellor Konrad Adenauer, in protest against the Israeli-German reparations agreement.

[11] Sometime after midnight, on March 4, 1957, the men arrived at the Tel Aviv apartment complex building where Rudolf Kastner had been living with his family, and shot him three times.