Why was gandhiji decided to call …

Called off the movement.

The Rowlatt act, which was passed in 1919,authorised the government to imprison any political person without trail and convictions in a court of law for two years. The act was widely condemned as black legislature and Gandhiji launched a national wide satyagrah against the act, which began with the hartal on 06 April 1919. Rallies were organised in various cities, workers went to strike in railway workshops and shops were closed down. The protesters clashes with police at many places and attacked government buildings. The British came up with heavy hands on the protesters, arrested many leaders and imposed martial law in punjab, were hundreds were killed and injured at jallinwalla bagh on 13th of April 1919.The government responded with brutal repression and some villages were bombed, seeing violence spread, Gandhiji finally called off the government.