Shlomo Ben-Yosef (; May 7, 1913 - June 29, 1938) was a member of the Revisionist Zionist underground group Irgun. He is most noted for his participation in an April 21, 1938 attack on a bus carrying Arab civilians, intended as a retaliation for an earlier attack by Arabs against Jews, and emblematic as a rejection of the establishment policy of Havlagah, or restraint. For this reason, and especially for having been the first Jew executed by the British authorities during the mandate period, Ben-Yosef became a martyr for the Revisionist cause and is commemorated by the State of Israel as one of 12 Olei Hagardom. Early life Shlomo Ben-Yosef was born Szalom Tabacznik in Lutsk, in the Volhynian Governorate of the Russian Empire (now in Ukraine) to a religious Polish-speaking Jewish family. He joined the Revisionist Zionist youth movement Betar in 1928, and two years later, he became the family breadwinner after the death of his father. In 1937, he decided to emigrate to Mandatory Palestine. After his application for an immigration certificate was rejected, he illegally immigrated to Palestine, arriving on September 20, 1937. There, he joined the Betar labor company at Rosh Pinna - upon arrival there, he burned his Polish passport and changed his name to Shlomo Ben-Yosef. Shortly after arriving at Rosh Pinna, he was accepted into the Irgun. He found a job at the port of Haifa. April 21, 1938 revenge attack On March 28, 1938, a car containing 10 Jews was ambushed by Arabs on the Acre-Safad road and six of them were killed. In revenge, Shlomo Ben-Yosef (24), Avraham Shein (17) and Yehoshua "Shalom" Zurabin (19), all of whom were Betar members from Rosh Pina, began planning a revenge attack. On April 21, 1938, armed with a hand grenade and two guns, Ben-Yosef, Shein, and Zurabin ambushed an Arab bus staged on the Tiberias–Rosh Pina road, a mountain road near Safed. Their plan was to destroy the engine with a hand-grenade; as the bus approached, they shot at it and Ben-Yosef tossed the grenade, which failed to detonate it. The bus drove away. The incident occurred at the crest of the 1936–1938 Arab Revolt, and during a high point in tensions between British authorities and the Revisionist Zionist movement. The three perpetrators were soon discovered hiding in a nearby cowshed in the possession of pistols and home-made bombs. Trial and execution Ben-Yosef,