This team carried a United Nations charter which sanctioned their activities. In fact, Justice League Task Force was comprised of several former Justice League Europe members. The team was called to action by Hannibal Martin, a representative of the U.N.. He asked that Martian Manhunter select a "strike team" of fellow Justice League members and to "lead them on a very special mission".
Core Members:
Martian Manhunter
The Ray
Gypsy
Triumph
Mystek
L-Ron
Members for One Mission:
Aquaman
Azrael (as Batman)
Batman
Bloodwynd
Booster Gold
Dolphin
Geist
Green Arrow
Joe Public
Hourman
Lionheart
Loose Cannon
Maxima
Nightwing
Robin
Seneca
Vixen
Members for Five Missions:
Black Canary
Blue Beetle
Bronze Tiger
Captain Atom
Crimson Fox
Doctor Light II
Damage
Elongated Man
Fire
The Flash III
Maya
Metamorpho
Power Girl
Tasmanian Devil
Osiris
Thunderbolt
Wonder Woman