Which husband-and-wife team was convicted of
passing information about the atomic bomb to the
soviets before being executed?

Julius and Ethel Rosenberg

Explanation:

Julius and Ethel were married in 1939.  They were member of the communist party. Ethels brother worked on the Manhattan Project and provided them with information.  The Rosenbergs in turn gave that information to Harry Gold.

Julius & Ethel were the first american non military who were every put to death for being spys

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