Who was attacked in the senate after he spoke out against slavery?

Senator Charles Sumner of Massachusetts was attacked in the Senate after delivering a speech in 1856 titled "The Crime Against Kansas," in which he condemned slavery and criticized pro-slavery senators. He was brutally assaulted by Congressman Preston Brooks of South Carolina, who struck him with a cane, severely injuring him. This incident highlighted the intense regional tensions over slavery and became a symbol of the escalating conflict leading up to the Civil War.