India, 1930. Sarojini Naidu is marching towards a British-controlled saltwork; behind her is a long column of protestors all dressed in white. The great campaigner for India's Independence, Gandhi, is now in jail. In his place, he's chosen Naidu to lead this movement against the hard and fearsome British Empire.

Naidu and her marchers want change, and they want to achieve it peacefully. India's fate, they believe, depends on a non-violent path to resistance.

Today, there will be violence. But it won't come from them.

This is the final episode in a four-part series about how to succeed without being a jerk. This episode is based on David Bodanis' forthcoming book How To Change The World, which is scheduled to be published in late 2025.