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During the first phase, several organizations (including Revisionists) led the effort; after World War II, the Mossad LeAliyah Bet ("the Institute for Aliyah B"), an arm of the Haganah, took charge.
From 1945 to 1948 he was in the Mossad LeAliyah Bet, commander of the Italy “station” and involved in the “La Spezia” affair.
In April 1950, an activist of Mossad LeAliyah Bet, Shlomo Hillel, using the alias Richard Armstrong, flew from Amsterdam to Baghdad as a representative of the American charter company Near East Air Transport, to organize an airlift of Iraq Jews to Cyprus.