Richard Bertrand Spencer is an American neo-Nazi, antisemitic conspiracy theorist, and white supremacist. Spencer claimed to have coined the term "alt-right" and was the most prominent advocate of the alt-right movement from its earliest days. He advocates for the reconstitution of the European Union into a white racial empire, which he believes will replace the diverse European ethnic identities with one homogeneous "White identity".

The alt-right is a far-right, white nationalist movement. A largely online phenomenon, the alt-right originated in the United States during the late 2000s before increasing in popularity and establishing a presence in other countries during the mid-2010s, and has been declining since 2017. The term is ill-defined and has been used in different ways by academics, journalists, media commentators, and alt-right members themselves.