Explanation:

 The Anarchical and Revolutionary Crimes Act, 1919, popularly known as the Rowlatt Act, was a legislative act passed by the Imperial Legislative Council in Delhi on March 18, 1919, indefinitely extending the emergency measures of preventive indefinite detention, incarceration without trial and judicial review enacted in the Defence of India Act 1915 during the First World War.

The Rowlatt Act came into effect in March 1919. In the Punjab the protest movement was very strong, and on April 10 two leaders of the congress, Dr. Satya Pal and Dr. Saifuddin Kitchlew, were arrested and taken to an unknown place.

The army was called into Punjab, and on April 13 people from neighbouring villages gathered for Baisakhi Day celebrations in Amritsar, which led to the infamous Jallianwala Bagh massacre of 1919.