She was one of 34 news media employees to be subpoenaed by the Senate after the testimony of journalist Winston Burdett, a one-time spy for the Soviet Union, in June 1955. Landsman worked as a Linotype operator at the time of her testimony in January 1956.
In June 1955, journalist Winston Burdett testified before the Senate, leading to the subpoenaing of 34 news media employees, including Landsman who was working as a Linotype operator at the time of her testimony in January 1956.