In my estimation, there has not been in American history a more important leak than Edward Snowden's release of NSA material – and that definitely includes the Pentagon Papers 40 years ago. Snowden's whistleblowing gives us the possibility to roll back a key part of what has amounted to an "executive coup" against the US constitution. Since 9/11, there has been, at first secretly but increasingly openly, a revocation of the bill of rights for which this country fought over 200 years ago. In particular, the fourth and fifth amendments of the US constitution, which safeguard citizens from unwarranted intrusion by the government into their private lives, have been virtually suspended.Daniel Ellsberg