The Shock Punch

The Shock Punch is a 1925 silent film boxing drama produced by Famous Players-Lasky and distributed by Paramount Pictures. It starred Richard Dix and Frances Howard.
It is preserved at the Library of Congress.
Plot.
Coming face-to-face with a couple of ruffians, champion boxer Terrence O'Rourke and construction worker Bull Mallarkey, the equally tough Randall Savage flattens each with a single punch.
Randall has a romantic interest in Dorothy Clark, whose father is erecting a new building. To get closer to her, Randall lands a job as a riveter. He then learns that not only is Bull Malarkey foreman of the crew, but is plotting to ruin Dorothy's father in business as well. Randall makes sure that doesn't happen.