Who was Robert Hanssen? FBI agent who spied for the Soviet Union and Russia

Spies are lurking in every country, from all governments. Dig up some dirt and ...
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Other spies in the series:
Mata Hari: Margaretha Geertruida Zelle, better known as Mata Hari, was a Dutch exotic dancer and courtesan who became a spy for Germany during World War I. She was accused of passing information to German intelligence and was executed by the French in 1917.
Aldrich Ames: Aldrich Ames was a CIA officer who spied for the Soviet Union and Russia. He provided classified information to the KGB for almost a decade, resulting in the execution of multiple US agents in the Soviet Union.
Julius and Ethel Rosenberg: Julius and Ethel Rosenberg were American citizens who were convicted and executed for espionage in 1953. They were accused of passing atomic bomb secrets to the Soviet Union during World War II.
Kim Philby: Kim Philby was a British intelligence officer and a member of the Cambridge Five spy ring that passed information to the Soviet Union during the Cold War. He served as a double agent and worked for the Soviet Union while working for MI6.
Robert Hanssen: Robert Hanssen was an FBI agent who spied for the Soviet Union and Russia for more than two decades. He provided classified information that compromised US intelligence operations and led to the deaths of several Russian intelligence assets.
Klaus Fuchs: Klaus Fuchs was a German-born physicist who spied for the Soviet Union during World War II and the Cold War. He passed classified information about the Manhattan Project to the Soviet Union and helped them develop their own atomic bomb.
Anna Chapman: Anna Chapman is a Russian intelligence officer who was arrested in the United States in 2010 along with nine other Russian spies. She was accused of passing information to the Russian government and was deported back to Russia in a spy swap.
Jonathan Pollard: Jonathan Pollard was a US Navy intelligence analyst who spied for Israel. He provided classified information to Israel for several years before he was caught and sentenced to life in prison.
Sydney Reilly: A Russian-born adventurer who worked as a spy for Britain in the early 20th century. He was known for his daring exploits, including an attempted assassination of Lenin.
Oleg Penkovsky: Oleg Penkovsky was a Soviet military intelligence officer who spied for the United Kingdom and the United States during the Cold War. He provided the West with valuable information about Soviet military capabilities, which helped to defuse tensions during the Cuban Missile Crisis. He was caught by the Soviet authorities and executed in 1963.