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We've had to warn you about this kind of thing before. Not cool.
Not saying this has to have any implications for Spanish Jews. Just not sure how actually "private" they are.
Israel has mandatory conscription, and 8200 (the army intelligence division) is a very common source for hi-tech companies in security sector.
To make it clear, I think it would be a very bad thing to revoke citizens' citizenship for any reason, let alone for the reasons you suggest.
What does this have to do with random jews in spain?