The Bombers Secret Society of Justice, otherwise known as the Bomber Gang, is a group of four kids in The Legend of Zelda: Majora's Mask for the Nintendo 64. The group consists of a leader, Jim, who excludes himself from the rest by garbing himself in a red beret, while the others are clothed in blue ones. They appear early on in the game, when Link is in his Deku Scrub formation, and thus they won't allow members of other species into their small "gang".
Nevertheless, they laminate that if Link is capable of finding all four of the group's members in a game of hide-and-seek, then they'd give him a password which is obligatory to enter a required area - the Astral Observatory.
Because Link will then essentially be a member, they give him a Bombers' Notebook, something that everyone in the group obtains.
In The Legend of Zelda: The Wind Waker a similar gang of kids called the Killer Bees greatly resembled them, and hung out in their village of Windfall Island. It is understandably presumed that they are a reference of the Bombers Gang of Majora's Mask.