The first hunger strike undertaken by Mahatma Gandhi was Ahmedabad Mill Strike.
Kheda Satyagraha: People of Kheda were unable to pay the high taxes levied by the British due to crop failure and a plague epidemic. Hence, Gandhi organized this movement
Champaran Satyagraha: The farmers were protesting against to grow opium with barely any payment for it
Rowlatt Act Satyagraha : The Act restricted the freedom of expression and strengthened police powers, It was the movement against that