Imagine you have a secret diary that you write down all of your private and personal thoughts in. Now imagine you work for a really important organization, like the government, and they tell you to keep all of their secrets a secret too.
Philip Agee was a man who worked for the United States government many years ago. He was like a secret spy man, and he had a really important job. But one day, he started to see things that he didn't like. He didn't like that his government was doing things that he thought were wrong and against the law.
So, he decided to write down all of these secrets in his own diary like you have your secret diary. But, Philip Agee's diary wasn't really a secret, because he started to tell other people what was in it. He told important people in other governments, and he even wrote a book about the things he learned from the government.
Some people thought what he did was really bad, because he was telling secrets that were supposed to be secret. But other people thought what he did was really brave, because he was telling the truth about some really bad stuff that the government was doing.
In the end, Philip Agee was seen as a controversial figure. Some people see him as a hero for standing up for what he believed in and exposing the truth. Others see him as a traitor for sharing government secrets. But, no matter what you think about him, he definitely changed the way people see the government and what they do.