Capra’s films were considered left-wing agitprop by many at the time. ‘Mr Smtih Goes To Washington’, with its depiction of American goverment as corrupt was probably used as anti American propaganda overseas. ‘It’s a Wonderful Life’ is about an evil capitalist.
It’s a Wonderful Life bombed when it was released, the only reason it got a second chance is because some moron screwed up the copyright.