Work is beginning on “Black Mass,” the movie about Whitey Bulger starring Johnny Depp as the imprisoned South Boston mob boss. C.P. Casting is set to hold auditions for the movie, and is looking for “men, women, and children of all ethnicities and types. Italian wise guys, Irish tough guys, politicians, Southie on St. Patrick’s Day, people with cars from the ‘70s/’80s.” Auditions are Saturday and Sunday from 1 to 6 p.m. at the Boston Teachers Union in Dorchester. The open call is for extras and speaking roles. The film will shoot from May 19 to Aug. 1. C.P. Casting says anyone planning to audition should bring a photo (and to expect that it won’t be returned). Based on the book by former Globe reporters Dick Lehr and Gerard O’Neill, the film “Black Mass” will also star Guy Pearce as one of Whitey’s brothers, presumably William “Billy” Bulger, the former president of the state senate and UMass. It’s one of two Bulger movies in the works. The other is being developed by Ben Affleck and Matt Damon based on a script by Aaron Stockard, who worked with Affleck on “The Town” and “Gone Baby Gone.”Mark Shanahan can be reached at email@example.com. Follow him on Twitter @MarkAShanahan. Meredith Goldstein can be reached at firstname.lastname@example.org. Follow her on Twitter @MeredithGoldste.