Violent Playground is a 1958 film directed by Basil Dearden and starring Peter Cushing, Stanley Baker and David McCallum. It centers on a Liverpool street gang led by Johnny Murphy (McCallum). When local Juvenile Liaison Officer Sergeant Truman (Baker) visits the Murphy household, with the view that if you catch kids at an early age, they will end up being responsible adults. Truman becomes romantically involved with Johnny s sister and also finds considerable points of similarity between his previous investigations into the activities of an arsonist known as the Firefly and his investigation of Johnny.