Key figures in Rosenberg case called to testify. Harry Gold (right), and admitted career for Soviet atomic spy ring, and a key figure in the Rosenberg case, was called by the Senate internal security subcommittee today for information on the use of Americans in Soviet intelligence activities. Left-to-right, Joseph G Oreto, US Marshall, David Greengrass, brother of miss Rosenberg, US Marshall William O Collins, and Harry Gold. 26 April 1956