From the early 1950's to the mid 1970's, the U.S. embassy in Moscow was purposefully bombarded by radio frequency radiation 24 hours a day. The U.S. embassy workers experienced what the perpetrators identified as "Radio Frequency Sickness Syndrome."
After some time of concentrated radio frequency radiation exposure, the American ambassador developed leukemia. The next American ambassador also developed leukemia. Blood tests performed on embassy staff members showed irreversible DNA damage.