After the burning of Lawrence, this man led a retaliatory raid at Pottawatomie Creek.
He lived on land provided by the philanthropist Gerrit Smith, who was one of this man's chief financial backers, as was the preacher Thomas Higginson. His agent in New England, Franklin Benjamin Sanborn, urged this man not to undertake his most famous action, and in Chatham, Ontario, this man proposed a new constitution for the United States. After the burning of Lawrence, this man led a retaliatory raid at Pottawatomie Creek. For 10 points name this man who was hanged in 1859 for leading the abolitionist raid on Harpers Ferry. 
He lived on land provided by the philanthropist Gerrit Smith, who was one of this man's chief financial backers, as was the preacher Thomas Higginson.
John Brown