ActIve
Chaotix
Knuckles the Echidna (leader)
Julie-Su
Mighty the Armadillo
Espio the Chameleon
Vector the Crocodile
Charmy Bee
Saffron
Ray the Flying Squirrel
Rouge the Bat (temporary)
Heavy (formally)
Bomb (formally)

Forty Fathom Freedom Fighters
Ray - Leader
Big Fluke - Agent
Bottlenose - Agent
Bivalve - Agent
P.B. Jellyfish - Agent

Knothole Freedom Fighters
Current Members
Field Leader - Princess Sally Acorn
Primary Field Agent - Sonic the Hedgehog
Field Agent/Pilot/Brain Trust Engineer - Miles "Tails" Prower
Field Agent/Pilot - Commander Antoine D'Coolette
Field Agent - Bunnie D'Coolette
Field Agent/Inventor/Brain Trust Chief Engineer - Rotor Walrus
Artificial Intelligence - NICOLE
Field Agent - Amy Rose
Field Agent - Dulcinea "Dulcy" the Dragon

Former Members
Field Agent - Fiona Fox (defected)
Field Agent - Mina Mongoose (resigned)
Field Agent - Nate Morgan (deceased)
Field Agent/Brain Trust Engineer - Sir Charles Hedgehog (resigned; elected member of the Council of Acorn)
Field Agent/Brain Trust Engineer - Snively Kintobor (defected)
Field Agent/Brain Trust Assistant - Tommy Turtle (deceased)

Wolf Pack
Lupe
Reynard
Canus
Diablo
Leeta
Lyco
Aerial
Athena
Drago - (banished)

Inactive
Crazy Kritter Freedom Fighters (destroyed by the High Sheriff)

Original Freedom Fighters
Colonel Tig Stripe - Leader
Spot Long - Agent
Sir Peckers - Agent
Trey Scales - Agent
MP Bull Bones - Agent

Robotropolis Spy Network (destroyed by Dr. Ivo Robotnik)
Sir Charles Hedgehog
Sleuth Dog
Kicks a Lot
Fly Fly Freddy

Rebel Underground (dismantled - some members have since become the Royal Secret Service)
Armand D'Coolette - founder
Geoffrey St. John - leader
Smiley
Fleming

Royal Secret Service
Commander Geoffrey St. John
Hershey St. John
Valdez - (deceased)
Heavy - (destroyed)
Bomb - (destroyed)
Wombat Stu - (resigned)
Commander Ian St. John - (deceased)
Commander Smiley - (retired)
Colonel Sommersby - (retired)
Lieutenant Fleming - (retired)

Substitute Freedom Fighters
Larry Lynx - Leader
Penelope Platypus - Agent
Cyril - Agent
Dylan - Agent
Hamlin - Agent
Arlo - Agent

Council of Acorn
King Elias Acorn (leader)
Rotor the Walrus (member)
Sir Charles Hedgehog (member)
Rosemary Prower (member)
Hamlin (member)
Penelope Platypus (member)
Dylan (member)

Status Unknown
Arctic Freedom Fighters
Guntiver - Leader
Augustus - Agent
Erma - Agent
Flip - Agent
Sealia - Agent

Downunda Freedom Fighters
Walt Wallabee - Leader
Barby Koala - Second in Command/Agent
Wombat Stu - Agent
Guru Emu - Agent
Duck "Bill" Platypus - Agent

Sand-Blasters (ex-communicated)