During the mccarthy era, which of the following was (were) executed for allegedly giving atomic secrets to the soviet union?

a. klaus fuchs
b. whittaker chambers
c. julius and ethel rosenberg
d. alger hiss

It was A. Klaus Fuchs who was executed for allegedly giving atomic secrets to the Soviet Union during the McCarthy era. Klaus Fuchs was a German theoretical physicist and atomic spy who, in 1950, was convicted of supplying information from the American, British, and Canadian Manhattan Project to the Soviet Union during and shortly after the Second World War.