Submission: Silas Soule (1838-1865). He was an abolitionist and a member of the Immortal Ten (a militant abolitionist group) with John Brown, but originally worked on the Underground Railroad. He also helped other abolitionists escape from jail, and was actually the guy who gave the Immortal Ten their name! (Cue 'fish fear me, women love me' but its confederates instead of fish and me instead of women)
Later he joined the army, and proved his bravery at the Battle of Glorieta Pass. His commander at Glorieta Pass was called John Chivington, and he was known as the 'fighting parson' due to his religious extremism (tw: discussion of genocide from now on. I try to avoid the details, but yeah. Bad shit happens). Chivington was ordered to kill Native Americans, and he did so gladly. This culminated in the Sand Creek Massacre, considered one of the worst atrocities ever committed by the US army. Silas refused to participate in the massacre, ordered his men to not fire, and even tried to rescue some of the Native Americans. Afterwards he wrote to his previous commander detailing the massacre, and Chivington left the army in disgrace. If it wasn't for Silas, nobody might have found out about Sand Creek. Silas was shot dead one night, presumably in retaliation for speaking out against injustice. His murderers escaped punishment.
So he's a personal hero of mine. Since I first learnt about the Indian Wars in school, I've always respected his moral strength and determination to tell the truth. As far as I'm concerned, he's gorgeous as well. Apparently he was super friendly too, and had a great sense of humour! What a guy! Probably one of my longest standing crushes XD. I never shut up about him, as proved by the length of this ask, which could have been summarised as 'he's cute and also not racist'.
Oh, and a plaque was installed where he died, and people still leave flowers at his grace (he's buried in Denver, and its a dream of mine to visit his grave) <3