Gentlemen in White Vests
Die Herren mit der weißen Weste (original)
Upon retirement, an elderly judge enlists pensioner friends to help him outwit a boxing promoter who, for many years, has been involved in criminal and shady activities and shut down his underworld connections and would-be gang of master thieves.
Starring Martin Held, Walter Giller, Heinz Erhardt, Agnes Windeck, Hannelore Elsner, Mario Adorf, Rudolf Platte, Rudolf Schündler, Willy Reichert, Herbert Fux
Watch "Gentlemen in White Vests" on Amazon released in 1970. It's a crime and comedy movie, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of movie, and is currently only available for purchase or rent.