Gangster Squad:

Gangster team Ruben Fleischer,  crime film directed by Josh Brolin, Ryan Gosling, Nick Nolte, Emma Stone and starring Sean Penn, from a screenplay written by Will Beall.
Gangsters in the 1940s and early 50, Los Angeles detective story LAPD is free to try for the first time on September 7, 2012 to be released  The 2012 shooting in Aurora in the background, the film premiered on January 11. by 2013, Warner Brothers released bumped up to date

Plot:

World War II Los Angeles, mobster Mickey Cohen (Sean Penn) has become the most powerful man in the criminal underworld. Prestigious Cohen, organized crime, and he is committed to the continual growth of Los Angeles, "the city" is not able to stop the growth of the Los Angeles law enforcement. Cohen and Cohen's Stone Witness testimony afraid of the police and the political impact of his control of the company made.
Parker Cohen (Nick Nolte), turn off the machine resolves to burn down a standard for the Los Angeles Police Department officers. Cohen stopping Exclusive. Parker, recruiting additional staff responsible for the honorary police chief Sgt John Savage (Josh Brolin). His wife, Connie (Mireille Enos) and began work as a man with the help of the devil to destroy the work of Cohen. 

Assosiation with the 2012 Aurora Shooting:

The first trailer for Gangster Squad was released on May 9, 2012. In the wake of the theater shooting in Aurora, Colorado on July 20, the trailer was pulled from running before films and airing on television, and removed from Apple's trailer site and YouTube due to a scene in which characters shoot submachine guns at moviegoers through the screen of Grauman's Chinese Theatre.

It was later reported that the theater scene from the film will be either removed or placed in a different setting, since it is a crucial part of the film, and the film will undergo additional re-shoots of several scenes to accommodate these changes, which would result in the release of Gangster Squad to be moved back to a later date. About a week after the shootings in Aurora, Warner officially confirmed that the film will be released on January 11, 2013, bumped from the original September 7, 2012 release date. Just two weeks later, on August 22nd, the cast reunited in Los Angeles to completely re-shoot the main action sequence of the film. The new scene was placed in a version of Chinatown where the Gangster Squad comes into open conflict with the gangsters as they strike back at the Gangster Squad. Josh Brolin said he was not sad the original 'movie theatre' scene was cut, and admitted that this new version is just as violent.