A euphemism for white supremacism.
'alt-right' or 'alternative right' is a name currently embraced by some white supremacists and white nationalists to refer to themselves and their ideology, which emphasizes preserving and protecting the white race in the United States in addition to, or over, other traditional conservative positions such as limited government, low taxes and strict law-and-order. The movement has been described as a mix of racism, white nationalism and populism ... criticizes "multiculturalism" and more rights for non-whites, women, Jews, Muslims, gays, immigrants and other minorities. Its members reject the American democratic ideal that all should have equality under the law regardless of creed, gender, ethnic origin or race.
The Alt-Right have elevated extremism in the GOP.
“The alt-right, or alternative right, is a loosely-connected and somewhat ill-defined grouping of white supremacists, neo-Confederates, neo-Nazis, neo-fascists, and other far-right fringe hate groups.”
The Alt-Right is a loosely-connected group of white supremacists, neo-nazis, neo-fascists and other far right-wing subcultures from America and Western Europe. They believe that the left is now the predominant political movement of the elites, and has infiltrated our media, universities and governments. In order to conquer these areas back they are reappropriating a transgressive language once used by the left. At the core of their ideology is a fear of the foreign. They believe if the West doesn't act now, the demise of western civilization will be fact rather than fiction being overflown by other and “lesser” cultures.