In older times, the word gang didn't have such the negative tone that comes along with it today.
As time has gone on, the word gang has grown to be a word that many worry about when they hear it. It seems a gang has evolved from just being a group of people to a group of people that associate for some criminal or other antisocial purpose.
Here are the top 10 of the most dangerous gangs that you definitely don't want to come into contact with.(note: Dawood's D gang has not been included):