That's one of the things I like about forums like this, the introduction of cameras I've never heard of. I've just checked out the Agfa Clack and my paypal fingers are getting itchy!
Because Hitler may have made them illegal because of the name "Brownie" like the book "Black Beauty" was banned in South Africa under apartheid, although it was only about young girls love for a horse.
You British seem obsessed with Hitler... But to be on topic, Kodak promoted back then their box cameras as "proudly made in Germany" (or something in that line, can't find the ad at the moment). Never saw here postwar Brownies either.
I think Sinatra was a good actor, so must have had some affinity to cameras; and apparently he was a reasonably competent gangster crony; but I never could stand his music.