Explanation: Gandhi was requested by Rajkumar Shukla, a local man, to investigate the problems of the farmers in context of indigo planters of Champaran in Bihar.

• The European planters had been forcing the peasants to grow indigo on 3/20 part of the total land (called tinkathia system).
• When towards the end of the nineteenth century German synthetic dyes replaced indigo, the European planters demanded high rents and illegal dues from the peasants to maximize their profits before the peasants could shift to other crops.

Source: Spectrum