What did Alger Hiss, Whittaker Chambers, and Ethel Rosenberg have in common?All were subjects of espionage investigations that occurred as part of a Red Scare. All were senators that participated in the investigations of the McCarthy era. All were newscasters that helped make television the medium people turned to for information. All played a part in developing the agreements that formed the basis for the United Nations.

All were subjects of espionage investigations that occurred as part of a Red Scare

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.