Brotherhood of Mutants (X-Men Movies)

The Brotherhood of Mutants is an organization and serve as the primary antagonists of the original X-Men move trilogy and are the first antagonists to the entire X-Men Cinematic Universe. It's an organization that was founded and lead by Magneto as they viewd for mutant supremacy and the destruction of the X-Men.

Foundation
The Brotherhood was founded sometime around 1962 sometime after the Cuban Missile Crisis by Magneto. Following the deaht of Sebastian Shaw, the Hellfire Club had disbanded and the remaining members all joined up with Magneto and became the founding members of the brotherhood. The original brotherhood mainly consisted of Azazel, Angel Salvadore, and Riptide who were all former members of the Hellfire Club and Mystique was also recruited as well. Soon afterwards, the very first mission of the Brotherhood was to attack the CIA Headquarters and free Emma Frost and she eventually joined shortly afterwards. Most of the original members would be killed however between 1962-1973 with Operation WideAwake killing Angel, Azazel, and Emma Frost. The fate of Riptide was unknown but Magneto and Mystique survived and went into hiding.

​X-Men
Decades later in the 21st Century, the mutants had became well-known by the general public and were villified. The Brotherhood of Mutants had survived and were being lead by Magneto. Magneto and Mystique were back but the Brotherhood had also recruited Toad and Sabertooth into their ranks and were plotting to use Rogue, an X-Men member, to power a conversion machine to turn humans into mutants and this lead to both the Brotherhood and the X-Men fighting in New York City. Storm had fought Toad and she electrocuted Toad and killed him and Sabertooth was knocked over the Statue of Liberty by Cyclopse. Afterwards, Magneto was arrested  and sent to a plastic prison and Mystique went into hiding.

X2: X-Men United
Sometime after Magneto's imprisonment, Mystique had returned and broke out Magneto to lead the Brotherhood once more. X-Men member Pyro during this time, becomes more sympathetic with the Brotherhood and its ideology and eventually joined the brotherhood after defeating Stryker's plan to exterminate all mutants along with the X-Men.