HC Deb 01 July 1937 vol 325 c2135
25. Major Carver

asked the Home Secretary whether he has any further statement to make in regard to the alleged existence of the knock system at Dartmoor?

Sir S. Hoare

I understand that the authority for the alleged existence of the "knock" system was an article by an ex-convict which appeared in a newspaper on 18th June. I can only repeat that the allegation is entirely unfounded.