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It is essential to seek out enemy agents who have come to conduct espionage against you and to bribe them to serve you. Give them instructions and care for them. Thus doubled agents are recruited and used.

There will always be spies. We have to have them. Without them we wouldn't have got Osama bin Laden - it took us years, but it happened.

From infancy on, we are all spies; the shame is not this but that the secrets to be discovered are so paltry and few.

When sorrows come, they come not single spies, but in battalions.

The commanding general publishes, for the information of all concerned, that hereafter all persons found within our lines who commit acts for the benefit of the enemies of our country will be tried as spies or traitors, and, if convicted, will suffer death.

Having now reached a point where danger might be reasonably apprehended from strolling war parties of Indians, spies were kept in advance and strict diligence observed in the duty of sentinels.

Breaking a cardinal rule of spy craft, I actually let it be known that I wanted to work for the CIA.

I was with the CIA for only three years. I worked in the Directorate of Operations, which is now called the National Clandestine Service. It's the part of the organization where the spies live. I didn't have much experience beyond the training.

We need spies that look like their targets, CIA officers who speak the dialects terrorists use, and FBI agents who can speak to Muslim women who might be intimidated by men.