Zaslansky, who had by then shortened his surname to Zaslani, was recruited by Dov Hoz to the Haganah and assigned to intelligence missions on behalf of the Yishuv leadership, receiving the underground alias "Shiloah."

His first mission abroad was in 1932 as an envoy of the department to Iraq, where he operated under the cover of a Hebrew teacher and a student of Oriental Studies at the University of Baghdad.

In this role, Zaslani helped establish the Special Night Squads and maintained contact with the unit's commander, Orde Charles Wingate.

[1] Shiloah recognized the potential in forging ties with the United States and developed relationships with the Office of Strategic Services (OSS), the precursor to the CIA.

Zaslani, who served as head of the Special Affairs Section of the Jewish Agency's Political Department, suggested to Dayan that they establish a spy network to assist the British Army.

With its approval and support, the network operated for about a year, until the defeat of Erwin Rommel's forces at the Second Battle of El Alamein.

[2] He was a member of the Jewish Agency delegation to the San Francisco Conference in 1945, which lobbied for the inclusion of Article 80, Chapter 12 in the United Nations Charter.

It oversaw the Political Department and was supposed to coordinate the activities of the other two bodies – Shabak and AMAN (the IDF's intelligence branch).

[4] In the following period, the "Coordination Bureau" under Shiloah's leadership took on more and more responsibilities and roles, and on April 1, 1951, the Political Department's operations were transferred to a new body, "Mossad."

For a few months, he remained the chairman of the Committee of Heads of Services, but he also resigned from this position when he was appointed in 1953 as a diplomatic envoy to the Israeli Embassy in the United States, a role he fulfilled until 1957.

During this period, his two main focuses were developing relations with peripheral nations and attempting, alongside Deputy Defense Minister Shimon Peres, to secure Israel's entry into NATO.