<human>:  With regards to the history of gang warfare, what was the first gang to use firearms?
<bot>: The first gang to use firearms was the Gang of Four in the early 20th century. The Gang of Four was a criminal organization that was active in New York City in the early 1900s. The gang was founded by four Italian immigrants, who were known as the Four Horsemen of the Apocalypse. The gang was notorious for its brutality, and its members were known to execute their enemies in the most gruesome ways possible.