In the 40's, New York was divided in several Mafia Gangs; Stark's runned by Howard Stark and his son Anthony, Steve Rogers' and Bucky Barnes' and their Howling Commandos, Thor's group known as The Asgardians, Loki's and HYDRA. The war starts when Howard gets shot and Tony gets all the gangs together creating SHIELD and The Avengers to fight against Loki and HYDRA. Complete AU.