I'm a former german "Unteroffizier" from the signal corps, equivalent 1st Sergeant in the US Army. After having finished my service and entered the reserve status, I got a security assessment from the german MAD, something like US Army Intelligence.
Among other more or less silly questions, two oft them stuck out:
"Are you or have you been member of the KPD (Kommunistische Partei Deutschlands)?
- well this party had been outlawed and didn't exist since when I was the age of 2 (1956)
"Have you been meber of the "Nationalkomitee Freies Deutschland"?
- well this was an organisation founded by german officers and german communist emigrants in the Soviet Union in 1943. It was dominated by the communist members, but by far not all members were communists, especially not the officers up to the most prominent "Generalfeldmarschall Paulus".
What ridiculed the question, well this organisation was dissolved before even the "Bundesrepublik Deutschland" had been founded in 1949, remember I was born 1954.
I rightout served the questionnaire to the trashcan and have never got a request later.
BTW: this happened in 1992 AFAIR.