Minute-Man shared something in common with the Justice Society of American around the same period of time. Each of them encountered a nefarious organization known as the Black Dragon Society, each led by a mysterious head who manipulated them from behind the scenes. On Earth-Two, this Japanese para-military terrorist organization dabbled in various weaponry to perplex the JSA while they were more mundane on Earth-S when they captured Minute-Man's attention.
On Earth-One, a somewhat different yet just as evil organization incurred the wrath of caped crusaders everwhere with the appearance of the Sensei and his League of Assassins, an evil organization that crossed paths with Aquaman, Batman, Superman, and their fellow Justice Leaguers. Their modus operandi were similar to that of the Black Dragon Society, with the League being led by a wisened wicked old bearded man without an identity, incorporating advanced technology to defeat seemingly superior foes. Still, despite near inexhaustible resources and fanatical followings guided by masterful strategists, these gruesome gangs always came up short when facing the finest of three parallel planets.