The non-cooperation movement was a political campaign launched on 4 September 1920 by Mahatma Gandhi to have Indians revoke their cooperation from the British government, with the aim of persuading them to grant self-governance.
This came as result of the Indian National Congress (INC) withdrawing its support for British reforms following the Rowlatt Act of 18 March 1919 – which suspended the rights of political prisoners in sedition trials, and was seen as a "political awakening" by Indians and as a "threat" by the British—which led to the Jallianwala Bagh massacre of 13 April 1919.