1. Military Intelligence, Section 6 (MI6)
Founded: 1909
Headquarters: London, United Kingdom
M16 is the oldest intelligence agency on our list and it existed even before World War I. It’s endured all the world wars and it performs humanitarian and political actions, which justifies its position on our list.
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That concludes our list of the world’s deadliest intelligence agencies. While it was ranked simply by age due to a lack of available data, it still shows how intelligence agencies function in the world to protect countries.
