Bike gangs are any group that is similar to or emulates Hell’s Angels, Bandidos, Cossacks, etc. such as most of those at the Twin Peaks when the shooting started.
Ordinary law abiding citizens who ride as well as “Law Abiding” Veteran or Christian type groups are not gangs.
I do think that generally we all are able to recognize a motorcycle gang and gang members, by their actions, appearance and demeanor. Whether someone (such as a FR poster) wishes to admit that fact is another question.
Did that answer the question?
No, but thanks for playing.