Task: Text Categorization
Input (English): This man convened a constitutional convention in Chatham, Canada, and took the pseudonym "Isaac Smith" while living at the Kennedy Farmhouse in order to scout out one target. Emily Dickinson's correspondent Thomas Wentworth Higginson was among the "Secret Six" who supported this man. He arrived at the Wakarusa War just as a peace treaty was about to be signed in Lawrence, Kansas. This man killed five pro-slavery settlers in the 1856 Pottawatomie massacre, and was quashed by Robert E. Lee in his attempt to seize a federal arsenal. For 10 points, name this abolitionist who was hanged after leading the raid on Harpers Ferry in 1859.
Output (English): History