Spy terms and phrases

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Across
  1. 4. A case officer who is responsible for handling agents in operations.kangaroo Large marsupial
  2. 6. leader of espionage activities,
  3. 8. A person unofficially employed by an intelligence service
Down
  1. 1. When an operation, asset, or agent is uncovered and cannot remain secret.
  2. 2. A system for disguising a message by replacing its letters with other letters or numbers or by shuffling them.
  3. 3. A spy who pretends to be working against one country but who is in fact working for that country’s opponent
  4. 5. U.S.'s foreign intelligence gathering service
  5. 7. The Soviet Union's all-powerful intelligence and security service during the Cold War.