As evidence, here is a list of hacker groups compiled by the editors of Phrack on August 8, 1988.
The Administration.
Advanced Telecommunications, Inc.
ALIAS.
American Tone Travelers.
Anarchy Inc.
Apple Mafia.
The Association.
Atlantic Pirates Guild.
Bad Ass Mother Fuckers.
Bellcore.
Bell Shock Force.
Black Bag.
Camorra.
C&M Productions.
Catholics Anonymous.
Chaos Computer Club.
Chief Executive Officers.
Circle Of Death.
Circle Of Deneb.
Club X.
Coalition of Hi-Tech Pirates.
Coast-To-Coast.
Corrupt Computing.
Cult Of The Dead Cow.
Custom Retaliations.
Damage Inc.
D&B Communications.
The Danger Gang.
Dec Hunters.
Digital Gang.
DPAK.
Eastern Alliance.
The Elite Hackers Guild.
Elite Phreakers and Hackers Club.
The Elite Society Of America.
EPG.
Executives Of Crime.
Extasyy Elite.
Fargo 4A.
Farmers Of Doom.
The Federation.
Feds R Us.
First Class.
Five O.
Five Star.
Force Hackers.
The 414s.
Hack-A-Trip.
Hackers Of America.
High Mountain Hackers.
High Society.
The Hitchhikers.
IBM Syndicate.
The Ice Pirates.
Imperial Warlords.
Inner Circle.
Inner Circle II.
Insanity Inc.
International Computer Underground Bandits.
Justice League of America.