While much attention is paid to the 34 US states that still administer the death penalty, federal and military systems of executions also exist. The retention of the US federal death penalty undermines those states that have abolished capital punishment– and federal executions undermine Washington's claims of world leadership in human rights.
Historically, perhaps the most well-known federal executions were of Julius and Ethel Rosenberg in New York. The Rosenbergs were convicted of Soviet espionage and electrocuted in 1953, at a time of anti-communist hysteria, amid charges of prosecutorial and judicial misconduct and a climate of antisemitism.
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http://www.guardian.co.uk/commentisfree/cifamerica/2012/jan/27/us-government-capital-punishment