From the introduction:
In the game, players take on the roles of members of the Union of Justice, a loose alliance of superhuman heroes, or members of the Anarchist Alliance, a group of superhuman villains organized to assist each other in criminal activities.
In the Name of Justice! - The Minigame of Superhuman Heroics! was released as a Preview Edition at GenCon Game Fair 1996. It was intended to be the quick start rules for Tomorrow's Heroes: Superhumans - The Role Playing Game of Superhuman Heroes and Villains, but that system was not produced, leaving In the Name of Justice! as an orphaned quick start system--still fully playable.