While Baker and others support using surveillance to tarnish the reputation of people the NSA considers "radicalizers," U.S. officials have in the past used similar tactics against civil rights leaders, labor movement activists and others.

Under J. Edgar Hoover, the FBI harassed activists and compiled secret files on political leaders, most notably Martin Luther King, Jr. The extent of the FBI's surveillance of political figures is still being revealed to this day, as the bureau releases the long dossiers it compiled on certain people in response to Freedom of Information Act requests following their deaths. The information collected by the FBI often centered on sex -- homosexuality was an ongoing obsession on Hoover's watch -- and information about extramarital affairs was reportedly used to blackmail politicians into fulfilling the bureau's needs.

Current FBI Director James Comey recently ordered new FBI agents to visit the Martin Luther King, Jr. Memorial in Washington to understand "the dangers in becoming untethered to oversight and accountability."

James Bamford, a journalist who has been covering the NSA since the early 1980s, said the use of surveillance to exploit embarrassing private behavior is precisely what led to past U.S. surveillance scandals. "The NSA's operation is eerily similar to the FBI's operations under J. Edgar Hoover in the 1960s where the bureau used wiretapping to discover vulnerabilities, such as sexual activity, to 'neutralize' their targets," he said. "Back then, the idea was developed by the longest serving FBI chief in U.S. history, today it was suggested by the longest serving NSA chief in U.S. history."

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