Question: What former Federal Bureau of Investigation agent is the film Breach based on?
Related documents: [0]  [DOC] Robert Philip Hanssen (born April 18, 1944) is a former Federal Bureau of Investigation (FBI) agent who spied for Soviet and Russian intelligence services against the United States for 22 years from 1979 to 2001. He is currently serving 15 consecutive life sentences at ADX Florence, a federal supermax prison near Florence, Colorado. [END] 
[1]  [DOC] Breach is a 2007 American historical and political thriller film directed by Billy Ray. The screenplay by Ray, Adam Mazer and William Rotko is based on the true story of Robert Hanssen, an FBI agent convicted of spying for the Soviet Union and later Russia for more than two decades, and Eric O'Neill, who worked as his assistant and helped bring about his downfall. O'Neill served as a consultant on the film. The film received generally positive reviews. [END] 
Answer: 
Robert Philip Hanssen
Robert Philip Hanssen