Toward the end of “The Most Dangerous Man in America: Daniel Ellsberg and the Pentagon Papers,’’ you begin to realize just how much four decades of history owe to one man.
If Ellsberg, a Defense Department-contracted policy analyst, hadn’t leaked 47 volumes of top secret CIA documents to the press and Congress in early 1971, the Vietnam War might have continued indefinitely. Broad public sentiment wouldn’t have finally turned against the conflict, and the Nixon administration wouldn’t have adopted a paranoid bunker mentality. The president wouldn’t have formed his dirty-tricks squad of White House “plumbers’’ to stop the leaks, wouldn’t have sent them out to dig up dirt on Ellsberg by burglarizing his psychiatrist’s office. The Watergate break-in wouldn’t have happened. Nixon wouldn’t have resigned.