Step 1: The Non-Cooperation Movement was launched under the leadership of Mahatma Gandhi with a strong emphasis on non-violence.
Step 2: On 4 February 1922, the Chauri-Chaura Incident occurred in Uttar Pradesh, where a violent mob set fire to a police station.
Step 3: As a result of this violence, several policemen were killed, which went against the principles of non-violence.
Step 4: Due to this breach of non-violent discipline, Mahatma Gandhi decided to suspend the Non-Cooperation Movement in February 1922.