Slashed tires, moved bookcases, a dead dog. For years, U.S. diplomats posted to Russia have experienced some strange things. WSJ’s Joe Parkinson and Drew Hinshaw report on the little-known spy unit, which U.S. officials believe is responsible for the surveillance and harassment of Americans in Russia, including WSJ reporter Evan Gershkovich. Further Reading: - Inside the Secretive Russian Security Force That Targets Americans  - Putin, Isolated and Distrustful, Leans on Handful of Hard-Line Advisers  Further Listening: - A WSJ Reporter Arrested in Russia  - Russian Court Upholds WSJ Reporter’s Detention  Learn more about your ad choices. Visit megaphone.fm/adchoices