goofer3, thanks for the link, the relevant part reading: -
Sergeant Frederic Harold Habgood, the plane’s bomber, was betrayed by a local woman to the Gestapo. On July 31 he was taken to the nearby Natzweiler-Struthof concentration camp and immediately hanged. He was 21 years old.
That was how the Gestapo worked (and indeed how any authoritarian regime's secret police works). Relatively few of them could rely upon an army of co-operative sympathisers or compromised informers to provide them with their information. Settling old scores alone accounted for many 'enemies of the people'. Certainly kept Klaus Barbie busy for instance.
The same system was ready to go into immediate operation in the UK following a successful Operation Sea Lion...