People boycotted because of taxes and lay firms and so the colonist didn't like that so the colonist just stopped buying British goods.
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The boycott was in support of poorly-paid farm workers. Lettuce was also boycotted.
A socially responsible consumer might boycott a company that uses child labor.
The main boycott was on 1st April 1933 with stormtroopers standing outside Jewish-owned shops. It was not particularly successful and was not repeated in that form.
The company might fear that the letter-writing campaign will become a boycott if it doesn't respond
the money either goes to the people that have died families or goes to the hospital to the people that are injured or badly hurt.