In 1882, the British estabilished a 'Salt Tax'. This tax was not fair, as it forced the salt market into monopoly; the Indian traders had to pay the tax, while the British were excluded. In 1930, Gandhi launched a campaign against this unfair policy. On the 12th of March, he started a march from Ahmedabad to Dandi, which culminated in Gandhi making salt. The march took until the 6th of April, during which he marched 388 kilometres, After freely selling his salt, he was imprisoned by the British.