THE GUARDIAN: I was there at the very nascent stages, when the government – wilfully and in deepest secrecy – subverted the constitution. All you need to know about so-called oversight is that the NSA was already in violation of the Patriot Act by the time it was signed into law.
When I was in the US air force, flying an RC-135 in the latter years of the cold war, I was a German-Russian crypto-linguist. We called ourselves the “vacuum-cleaner of the sky” because our capability to gather information was enormous at the time. But it was always outward-facing; we could not collect on US targets because that was against the law. To the US government today, however, we are all foreigners.
I became an expert on East Germany, which was then the ultimate surveillance state. Their secret police were monstrously efficient: they had a huge paper-based system that held information on virtually everyone in the country – a population of about 16-17 million. The Stasi’s motto was “to know everything”.
So none of this is new to me. The difference between what the Bush administration was doing in 2001, right after 9/11, and what the Obama administration is doing today is that the system is now under the cover and color of law. Yet, what 
Snowden has revealed is still the tip of the iceberg.
General Michael Hayden, who was head of the NSA when I worked there, and then director of the CIA, said, “We need to own the net.” And that is what they’re implementing here. They have this extraordinary system: in effect, a 24/7 panopticon on a vast scale that it is gazing at you with an all-seeing eye.
I lived with that dirty knowledge for years. Before 9/11, the prime directive at the NSA was that you don’t spy on Americans without a warrant; to do so was against the law – and, in particular, was a criminal violation of Fisa. My concern was that we were more than an accessory; this was a crime and we were subverting the constitution.
I differed as a whistleblower to Snowden only in this respect: in accordance with the Intelligence Community Whistleblower Protection Act, I took my concerns up within the chain of command, to the very highest levels at the NSA, and then to Congress and the Department of Defense. I understand why Snowden has taken his course of action, because he’s been following this for years: he’s seen what’s happened to other whistleblowers like me.
By following protocol, you get flagged – just for raising issues. You’re identified as someone they don’t like, someone not to be trusted. […] I got hammered: in November 2007, I was raided by a dozen armed FBI agents, when I was served with a search warrant. The nightmare had only just begun, including extensive physical and electronic surveillance.In April 2008, in a secret meeting with the FBI, the chief prosecutor from the Department of Justice assigned to lead the prosecution said, “How would you like to spend the rest of your life in jail, Mr Drake?” MORE