Karl Heinrich Meier was a Nazi sympathizer and Dutchman of German origin (then aged 24), who, with his accomplice Jose Waldberg, a German national (then aged 25), was hanged at Pentonville Prison in London on 10 December 1940, following his conviction at the Old Bailey the previous month, having been sentenced to death by Mr Justice Wrottesley.
[1][2] Meier and Waldberg sailed in a fishing trawler across the English Channel on the night of 3 September 1940.
Carrying a radio, a pistol, secret ink, maps, food and 60 pounds sterling, they landed at Dungeness.
[5] The two confessed and told of instructions they had received to "observe and report on military objectives, such as aerodromes, concentrations of troops, gun emplacements, and ammunition dumps" and to "mix amongst the civilian population in trains, beffets and public houses, listening carefully to all careless talk by indiscreet civilians".
[6] The Meier case was referred to in a television documentary The Germans Are Coming that screened on the Yesterday channel in 2011.