In Sweden we’ve recently had a case of two Iranian born brothers who both were working for Russian spy agencies.
Problem is that still a large minority of Israelis are not born in Israel. Also, a grandfather of Snowden was an Admiral, so who’s a spy?
In case you do not know, 800,000 Jews were evicted from Arab nations after the 1948 war for Jewish independence. This is about the same number of Palestinians who fled or were evicted.
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https://en.wikipedia.org/wiki/Jewish_exodus_from_the_Muslim_world
The Jewish exodus from the Muslim world occurred during the 20th century, when approximately 900,000 Jews migrated, fled, or were expelled from Muslim-majority countries throughout Africa and Asia, primarily as a consequence of the establishment of the State of Israel. Large-scale migrations were also organized, sponsored, and facilitated by Zionist organizations such as Mossad LeAliyah Bet, the Jewish Agency, and the Hebrew Immigrant Aid Society. The mass movement mainly transpired from 1948 to the early 1970s, with one final exodus of Iranian Jews occurring shortly after the Islamic Revolution in 1979–1980. An estimated 650,000 (72%) of these Jews resettled in Israel.[1]