There is no such thing as the alt-left.  Alt-right was a term invented by right wing journalism to hide the true nature of the neo-Nazis, KKK followers and plain old racists in their ranks.  Then they invented the term alt-left to make it seem as though there is an equivalent on the other side of the partisan divide.  There isn't.  The left is the side of the divide that works for equal rights for all instead of playing on the grievances of white men who view their position of privilege has diminished because there is less discrimination than there has been in the past.