Brotherhood

The Brotherhood of Mutants is a group dedicated to the cause of mutant superiority over humans. Throughout its various incarnations, the Brotherhood's agenda has gravitated towards either subjugating the human race to the will of mutants or eradicating humanity altogether. Magneto formed the Brotherhood of Evil Mutants shortly after the public debut of the X-Men

Further Reading Marvel Wiki

Non-game canon

 * Daken
 * Scarlet Witch
 * Quicksilver