Salomon turned to his private affairs. He established a farm on the land of the former Arab village Sheikh Munis and tried to advance other business initiatives. On the eve of the Sinai Operation (Operation Kadesh) in 1956, he was arrested by Israel's security agency, the Shin Bet, for one night and documents were taken from his home. In this period, the Shin Bet conducted surveillance on members of the opposition parties—this was deemed an infraction on democracy and ceased at the beginning of the 1960s. It seems that Salomon’s arrest was ordered after the security service listened in on a conversation between Salomon and his friend Moshe Sneh, who was a Knesset Member for the Mapam Party, due to fears that Salomon's links with senior members of the security establishment would lead to a leak of details concerning the planned military operation. The circumstances of his arrest were discovered by Ehud Avriel, then a Knesset member for Mapai, the ruling party, who complained to the head of the Shin Bet, Amos Manor. This episode came concluded after an investigation was conducted, at Salomon's request, following which the documents were returned to him and he received an apology.