Source 1 (Merriam-Webster Dictionary):
"A gang is a group of criminals or hoodlums who associate for the purpose of committing crimes, especially involving violence or drugs."
Source 2 (Federal Bureau of Investigation):
"A gang is an organized group of criminals, often operating in multiple states and even internationally, with a hierarchical structure and defined leadership. Gangs engage in illegal activities such as drug trafficking, extortion, violence, and other criminal enterprises."
By referring two sources provide a definition of the concept gang
1 answer