Why did Gandhiji choose to break the salt law?

In 1929, the Congress resolved to fight for complete independence or Purna Swaraj. Mahatma Gandhi knew that Purna Swaraj would never come on its own. It had to be fought for. Knowing that the need of the hour was direct action, in 1930, Gandhiji declared that he would lead a march to break the salt law. According to this law, the state had a monopoly on the manufacture and sale of salt. Gandhiji believed that it was sinful to tax salt as it was an essential part of food. He led a march to the coastal town of Dandi, where he broke the salt law by gathering natural salt found on the seashore, and boiling sea water to produce salt. This march related the general desire of freedom to a specific grievance shared by everybody, and thus, did not divide the rich and the poor.