In a nutshell about the 'Stern Gang'

Yitzhak Shamir was the operations commander and later leader of the Stern Gang, a terrorist group which was responsible for a string of political assassinations. Shamir was a member of two militant Jewish underground organizations which ... were active in counter-terrorist acts against Arabs as well as sabotage against the British. — The Department for Jewish Zionist Education (Note the use of the term counter-terrorist to disguise terrorism.)

In post-war British-mandated Palestine the words Stern Gang equalled "terrorism" — assassinations, bombings, the full works. ... Yitzhak Shamir had been the gang's operations commander. ... By appointing Shamir Foreign Minister, Prime Minister Menachem Begin had selected the organiser of two famous assassinations: the killing of Lord Moyne, the British Minister representative in the Middle East, in 1944, and that of Count Folke Bernadotte, the UN's special Mediator on Palestine, in 1948. — Stern Gang: what does 'mekhabbel' mean?

During the fight for Jewish statehood, extremist military groups sometimes resorted to the use of terrorist tactics. One such instance occurred in 1948 when members of the Jewish underground organization LEHI (Fighters for the Freedom of Israel) killed UN Peace Mediator Count Folke Bernadotte to protest his diplomatic efforts to modify the Palestine partition plan. ... Yitzhak Shamir reputedly played a role in planning the assassination; however, he was never tried and went on to become Prime Minister of Israel. — The Assassination of Count Bernadotte.