The Non - Cooperation Movement has had four main causes: 1. Jallianwala Bagh Massacre and Resultant Punjab Disturbances 2. Dissatisfaction with Montagu-Chelmsford Reforms 3. Rowlatt Act 4. Khilafat Agitation 1. Jallianwala Bagh Massacre and Resultant Punjab Disturbances On April 13, 1919, a large but unarmed crowd gathered at Amritsar in the Jallianwala Bagh to protest the arrest of their popular leaders, Dr. Saifuddin Kitchlew and Dr. Satyapal. However, this unarmed crowd of women and children, among others, was fired mercilessly with rifles and machine guns on General Dyer's orders. Thousands of people have been killed and injured. Martial law was proclaimed throughout Punjab after this massacre and the people were subjected to the most uncivilized atrocities. In order to investigate the Jallianwala Bagh incident and the role of General Dyer, the British government set up the Inquiry Disorders Committee, popularly known as the Hunter Committee after its chairman Lord William Hunter. While the Hunter Committee held General Dyer responsible for the Jallianwala Bagh massacre, it upheld his reasons for ordering the firing on the unarmed crowd as well as for imposing martial law in Punjab. The people of India, due to their clear biases, did not accept the recommendations of the Hunter Committee. There has been unrest among the masses to ensure justice for the wrongs of Punjab has been delivered. In protest, Mahatma Gandhi gave up the Kaiser - I - Hind title granted to him by the British government. 2. Unhappiness with the reforms in Montagu – Chelmsford The 1919 Government of India Act was enacted based on the 1918 Montagu - Chelmsford proposals recommendations. This Act introduced the ' Dyarchy ' system and divided topics into lists – Reserved and Transferred. The Legislative Assembly (lower house) was introduced with direct elections, but the right to vote was severely curtailed. In addition, there was no control over the Governor General and his Executive Council by the Legislative Assembly. Indian nationalists, however, had gone far beyond such stopping concessions. The Indian National Congress met under Hasan Imam's presidency at a special session in Bombay in August 1918 and condemned the reforms of Montagu - Chelmsford and instead called for effective self - government. 3. Rowlatt Act The government enacted the 1919 Anarchical and Revolutionary Crimes Act, popularly called the Rowlatt Act, based on the findings of the Rowlatt Committee. This act allowed the government to imprison any person suspected of terrorism for a maximum period of two years without trial. The government passed Montagu Chelmsford Reforms and Rowlatt Act in succession, which were part of the British ' Carrot and Stick policy. This action gave the movement a new direction. At all levels of India, Gandhi organized a mass protest. 4. Khilafat Movement The Khilafat Movement, which began in 1919, brought the Muslims and the Hindus on a common platform against the British rule, was the most important cause of the Non - Cooperation Movement.