Who coined the celebrated phrases "Simon Go Back" and "Quit India" during freedom struggles in 1928 and 1942 respectively?

Having founded the Bombay Youth League in 1928, he immediately organized a protest against the Simon Commision. He and other young men dressed up as coolies to get access to the Bombay port where they greeted the members of the commission with black flags and the slogan “Simon Go Back”. In 1942, at a meeting in Bombay, Gandhi conferred with his closest associates on the best slogan for the Civil Disobedience Movement. C Rajagopalachari suggested ‘Retreat’ or ‘Withdraw’ but it didn’t find much favour with the leader. It was this man who then came up with the succinct phrase — ‘Quit India’ — that got approval.