It’s hard to believe that the bearded, bespectacled, and disheveled professor in The Organizer is actually dashing Italian actor Marcello Mastroianni. But it is, and—instead of immersing himself in Rome’s decadent high society or struggling with a case of director’s block—Mastroianni’s character in Mario Monicelli’s 1963 film has more serious matters to deal with: namely, the organization of a strike at a factory in Turin. The Organizer kicks off the AFI Silver Theatre and Cultural Center’s 12-film series “50 Years of Janus Films, Part II,” the second installment of the institution’s planned trilogy of Janus retrospectives. In the following week, the series continues with a pair of ménage à trois dramas made by up-and-coming, 29-year-old directors who would go on to become filmmaking legends: Roman Polanski’s Knife in the Water and François Truffaut’s Jules and Jim. The series runs though Wednesday, Sept. 5, at the AFI Silver Theatre and Cultural Center, 8633 Colesville Road, Silver Spring. $9.25. (301) 495-6700; see Showtimes for this week’s films; see afi.com/silver/new/ for a complete schedule.