Answer:
All were subjects of espionage investigations that occurred as part of a Red Scare
Step-by-step explanation:
Ethel Rosenberg was the first citizen of America who was executed for espionage. She was accused of being a Soviet spy. She was sentenced to death on April 5, 1951. Ethel and her husband were executed in the electric chair at Sing Sing Prison in Ossining, New York.
Alger Hiss a government official in America. He was also accused of being a Soviet spy in 1948. In his trial, Whittaker Chambers who was a U.S Communist Party member testified against and accused Alger Hiss of being a communist and spy.