Nathan Bedford Forrest
https://en.wikipedia.org/wiki/Nathan_Bedford_Forrest
****
Forrest spoke at the 1868 Democratic National Convention. He pushed for one of his cronies to get the VP ticket that year. The KKK basically walked in and took over the Convention. During the war, Forrest is known for slaughtering Union soldiers who had surrendered after their Fort was taken. Two thirds of those men executed were black. His body count also includes various hits and lynchings he ordered done, as the KKK's first Grand Wizard, to fight the progressive changes after the end of slavery. Much of the voter suppression he created had lasting effects long after he died. When he could no longer use slaves, he rounded up prison convicts and used them as basically cattle to run his failing businesses.
To his credit, he was an excellent tactical commander on the battlefield, but to the dismay of black people everywhere, he represented much of the worst that the Democratic Party had to offer.
In contrast, Donald J Trump, after being accused relentlessly of being a white supremacist and supporting such organizations, gave Historic Black Colleges & Universities more federal aid than any other President in American history. He also pushed the Platinum Plan to allow more blacks to have more educational/work/rehabilitation opportunities. He pushed for and had a white supremacist, who drowned an 8 year old girl, after murdering her parents in front of her, to help fund his larger white supremacist organization, executed despite protests by the liberal anti-death penalty crowd. He got more votes from blacks in this last cycle than any other Republican in over 60 years. The rate of return for black male voters for Trump was unlike anything ever seen before in American political history for a Republican. As of last year, he was also on record, and noted by Kayleigh McEnany in response to another public accusation, to denounce white supremacy ( via video, audio, print, etc, all verifiable sources) more than any other President in American history.
Nathan Bedford Forrest was a Democrat.
Granted Trump is a 4th rate failed reality TV star, a stone cold narcissist, a grifter high level troll and acts like a total **** most of the time. But if he's what you'd classify as an "extremist", then where exactly would you categorize Nathan Bedford Forrest? I'm sure the tens of thousands of families who had their loved ones executed, beaten, maimed, suppressed, silenced, demonetized and lynched would also like to know how you'd label NBF if Trump is the litmus test of " supreme extremism"
So yes, it is very much a "both sides" thing.