In this list, we will take a look at the top 5 most dangerous spies in real life. Some you have never heard of, but they all got one thing in common, they are super dangerous.
5. Sidney Reilly
Known as the Ace of Spies, Sidney Reilly worked for a number of governments in the early 20th century. His most famous action was the assassination attempt on Vladimir Lenin of Soviet Union but his group was revealed and he narrowly escaped from Russia. He was captured later in his life and was executed by the firing squad.