Alarm at the Circus (1954)

Two boys from West Berlin, Klaus and Max, live in poverty. They dream of a career in boxing and save every penny in order to buy boxing gloves for training. Nevertheless, they cannot seem to save enough and so they let themselves be hired by the bartender Klott for a twisted scheme. However, Klaus overhears one of Klott's conversations and learns that Klott intends for the boys to steal horses from the East Berlin Barlay Circus, where Klaus recently made some good friends. Indignant, he sets out to stop the robbery—and an adventurous action story results.

Unfortunately the movie Alarm at the Circus is not yet available on HBO Max.