Ahmedabad
In 1918, Mahatma Gandhi went to Ahmedabad to organise a satyagraha movement amongst cotton mill workers.
Source: Chapter 2, Section 1.1 – The Idea of Satyagraha
The examiner expects just the place name — Ahmedabad — supported by a brief identifying statement. The source passage directly states this fact. Do not confuse this with Champaran (peasants) or Kheda (revenue/peasants); Ahmedabad is specifically linked to cotton mill workers.