Professor Sinigaglia (Marcello Mastroianni) is the title character in this darkly comedic Italian drama about mistreated factory workers in the city of Turin. Toiling away in appalling conditions in a textile mill, these employees have no one to stand up for them until Sinigaglia puts his academic career on the line by helping them to start a strike. Although the teacher comes under scrutiny by unsympathetic authorities, he maintains his dedication to the workers' cause.