Shlomo was born on February 16, 1917 in the town of Rubno in the Volyn district of Poland (now Ukraine). His parents were Yaakov, a wealthy merchant, and Rachel, a homemaker. He studied in cheder and afterwards in an elementary school that was part of the Tarbut system. Afterwards, he continued at the Tarbut Gymnasium. At age fourteen, he joined Beitar and assumed different roles, including being a member of the branch headquarters.
When Yair arrived in Poland and started organizing IZL cells, Shlomo volunteered for this task and, together with a friend, organized two cells in Rubno alone. In 1938, he joined a group from Beitar that was planning to make aliyah illegally. Organized by IZL, this was the Af al Pi movement. He arrived on 5.1.1939, on the ship Dalfa. The IZL men were waiting for them when they disembarked at Netanya’s coast, bringing them to safehouses.
Shlomo joined the Labor Company of Beitar in Netanya. When he finished his service, as IZL was splitting, he joined Lehi. In 1941, he moved to Jerusalem’s Old City. In early 1942, he was arrested and sent to the detention camp in Mizra, and from there to Latrun. Shlomo was one of the people who spent eight months digging a tunnel so he and nineteen of his friends (Lehi members) could escape, and they reached Tel Aviv safely. This operation shocked the British authorities and was a severe blow to their status.
After the breakout, he became part of the permanent Lehi staff, filling many varied important roles. He was involved in printing the periodical HeHazit and organizing the home front command of the underground in the Sharon and Samaria regions. Afterwards, he took charge of the Jerusalem branch, eventually becoming the Lehi treasurer.
With the establishment of the State, he was released from IDF duty to set up the Fighters’ List under the aegis of Lehi. After the Bernadotte assassination, Shlomo was imprisoned, but he managed to flee. When they tried to arrest him again on the street, he began running away, but he was shot and seriously injured. He was arrested by the Israel Police, and was hospitalized under guard in the Hadassah Hospital on Balfour Street in Tel Aviv. His comrades plotted to break him out, and he made his daring escape through a bathroom window, descending three stories by a rope ladder. His comrades were waiting. When general clemency was granted, he began his civilian life.
He set up a concrete factory where he worked. In 1953, he married Rachel Kozinets. They had three children: Yaakov, Arnon and Hava. He dedicated his public activity to Beit Yair.