What was the revolutionary act committed by Bhagat Singh?What was the sentence awarded to him by the British?

He killed Sanders for taking revenge of Lala Lajpat Rai's death.He also throw a bomb in assembly to tell British that now Indians are aware. He and his two other friends were awarded a death sentences. AT END I WANT TO SAY - HATS OFF TO BHAGAT SINGH , RAJGURU AND SUKHDEV.he also killed a commissioner with a revolver