Some interesting items unimaginable now. First, a reporter freely refers to Allied resistance in the Balkans as “terrorism.” Second, an American cardinal celebrating a mass in Iran.
The sentence is a bit complex, and the references vague:
As I read this, the term "Patriot activity" reflects the reporter's point of view, while the term "foreign military circles in Turkey" refers to German liaison officers.
This is important because Churchill's "bodyguard of lies" was working to convince Germans that the next Allied invasion would land somewhere -- anywhere! -- other than Sicily. ;-)