Brotherhood of Mutants

The Brotherhood was a team of Mutants led by Mystique, including Avalanche, the Blob and Pyro, with Rogue being shown as a former member. The Brotherhood was shown also to be initially financed by Apocalypse, though only Mystique knew of this. In Days of Future Past the Brotherhood attempts to assassinate presidential candidate Senator Robert Kelly.

Background
The Brotherhood seen on this series is Mystique's team that opossed the X-Men in the original comic version of "Days of Future Past". The only member of that roster absent from the series was Destiny.