The Star Witness (1931)

The Leeds family is thrown right in the middle of a war between the cops and gangland when they are the only witnesses to two murders committed by gang kingpin Maxey Campos. Initially positive in their identification of the murderer, their attitudes change when young Donny Leeds is kidnapped by Campos' boys. No amount of threatening with perjury by D.A. Whitlock can get them to tell the truth - except for cantankerous old Grandpa, civil war veteran, who berates his family for failing to do their civic duty, whatever the cost. Though having his doubts as to the credibility of his star witness, Whitlock is nevertheless taken aback when he learns Grandpa has disappeared just before he is to testify.