Spencer was one of the early leaders of the alt-right movement and the ones who basically lead that term. Alt-Right only became a representation of the dissident right when Milo basically put himself as a major force, almost displaying it as the decedent of the TEA Party. But, Milo didn't make much progress, and the White Nationalists were none-to-happy about a gay man with an inter-racial marriage subverting their movement.