Biography
Carl Ross was a Communist arrested in August 1953 and tried in San Francisco for sheltering Smith Act fugitives Robert Thompson and Sidney Steinberg during the McCarthy era. He was convicted of harboring on April 26, 1954.
The study confirms that Ross served his sentence for harboring Robert Thompson at McNeil Island Federal Penitentiary near Seattle. It does not establish more precise admission or release dates than the existing case.
Tuomas Savonen, Minnesota, Moscow, Manhattan, 2020, PDF page 201.