Exclusive: Anthony Mackie has joined the cast of the Warner Bros.-Village Roadshow period police saga ”Gangster Squad” opposite Sean Penn, Ryan Gosling, Josh Brolin and Michael Pena.Ruben Fleischer is helming from a script by former Los Angeles Police Dept. officer Will Beall. Dan Lin and Kevin McCormick are producing through Lin Pictures and Langley Park, respectively; Jon Silk, of Lin Pictures, is co-producing. Mackie will portray former LAPD lieutenant Rocky Washington. Project’s based on the Los Angeles Times’ seven-part series ”Tales From the Gangster Squad,” to which Warner acquired the rights two years ago. The articles, penned by Paul Lieberman, chronicled efforts the Los Angeles Police Dept.’s struggle with increasing crime and corruption in the 1940s, when the department formed the Gangster Squad to keep East Coast organized crime figures from planting roots. Mackie was last seen in ”The Adjustment Bureau.” He’ll be seen next in ”Real Steel.” Mackie is repped by UTA and Inspire Entertainment.