1.Rowlatt act was passed by British in 1919 as Indians went against the government. 2. It was hurriedly passed by the Imperial Legislature. 3.Whoever go against the government the imprisoned for 2 years without any trail (one such person was M.K.Gandhi he went to jail in 1922 and was released in 1924) 4.people who go against the government were termed as political prisoners.

The Anarchical and Revolutionary Crimes Act of 1150, popularly known as the Rowlatt Act also known as Black 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. It was enacted in light of a perceived threat from revolutionary nationalist organisations of re-engaging in similar conspiracies as during the war which the Government felt the lapse of the DIRA regulations would enable.Passed on the recommendations of the Rowlatt Committee and named after its president, British judge Sir Sidney Rowlatt, this act effectively authorized the government to imprison any person suspected of terrorism living in the Raj for up to two years without a trial, and gave the imperial authorities power to deal with all revolutionary activities.The unpopular legislation provided for stricter control of the press, arrests without warrant, indefinite detention without trial, and juryless in camera trials for proscribed political acts. The accused were denied the right to know the accusers and the evidence used in the trial.Those convicted were required to deposit securities upon release, and were prohibited from taking part in any political, educational, or religious activities.On the report of the committee, headed by Justice Rowlatt, two bills were introduced in the central legislature in February 1919. These bills came to be known as "black bills". They gave enormous powers to the police to search a place and arrest any person they disapproved of without warrant. A well known description of the bills at that time was: No Dalil, No Vakil, No Appeal i.e., no pleas, no lawyer, no Appeal. Despite much opposition, the Rowlatt Act was passed in March 1919. The purpose of the act was to curb the growing nationalist upsurge in the country.