The word gang is connoted by when, where, and why it is used. Gang is often used when a murder or vicious crime is committed. Gang is used in big cities such as Los Angeles or Chicago where crime is common. Gang is used for the purpose of describing a group of people engaging in criminal activity. Gang has a negative connotation associated with it.
The word club is connoted by when, where, and why it is used. Club is often used when a group of people gather to make quilts or read books.