Explanation: Gandhi, who had been at the forefront in offering cooperation in the British war effort, and who had even offered to encourage recruitment of Indians into the British Indian forces.

• He called the Rowlatt Act the “Black Act” and argued that not everyone should get punishment in response to isolated political crimes. Gandhi called for a mass protest at all India level.
• But soon, having seen the constitutional protest meet with ruthless repression, Gandhi organised a Satyagraha Sabha and roped in younger members of Home Rule Leagues and the Pan Islamists.

Source: Spectrum Modern India