Soviet Spies in America

There have been numerous instances where Soviet spies were discovered. This was mainly during the early years of the cold war. Some of them were discovered and others were not. It is said that Stalin new about the atomic bomb before Truman, who was the vice president, did. One spy was discovered when he gave a paper boy a hollowed out nickel as a tip. The paper boy discovered it was hollow and told the authorities. The spy was then arrested. Recently there was a huge case of spies sent from Russia who have been in the U.S. They were discovered last year and it was a huge scandal. They gave no really relevant information. Most of the information could have been found on the internet. This proves that there might still be Soviet spies in the United States. I have a Russian friend. I don't know for sure that he isn't reporting classified information to a Russian handler. You need to always be on the lookout for Soviet spies