Then-President Nixon's associates planned to attack antiwar protesters and whistleblower Daniel Ellsberg, NBC News reports. 

A never-published memo obtained by the network reveals that Watergate prosecutors had proof that Nixon operatives were targeting "long-haired demonstrators" at a 1972 Capitol rally and "in particular" bold-faced war opponents like Ellsberg. 

The ex-Pentagon official had accused the White House of sending CIA "assets" from Cuba to "incapacitate" him. Nixon aides denied the plot, but a 1975 memo by Watergate special prosecutor Nick Akerman backs up Ellsberg's claims. "They were unable to reach him for some reason," Akerman tells MSNBC. Prosecutors believed White House...

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