How could non cooperation became a movement?

Gandhiji proposed that the movement should unfold in stages. It should begin with the surrender of titles that the government awarded, and a boycott of civil services, army, police, courts and legislative councils, schools, and foreign goods. Then, in case the government used repression, a full civil disobedience campaign would be launched. Through the summer of 1920 Mahatma Gandhi and Shaukat Ali toured extensively, mobilising popular support for the movement. Many within the Congress were, however, concerned about the proposals. They were reluctant to boycott the council elections scheduled for November 1920, and they feared that the movement might lead to popular violence. In the months between September and December there was an intense tussle within the Congress. For a while there seemed no meeting point between the supporters and the opponents of the movement. Finally, at the Congress session at Nagpur in December 1920, a compromise was worked out and the Non-Cooperation programme was adopted.