Those historical protests were the result of wealth and government power, not average Joes banding together to protest.  The hippie movement was started by the government.  Even today the vast majority of protesters are paid by moneyed interests.    

The people hold no power; the government possesses the weapons.   You have your vote as to which tyrant is going to tell you how to live.  The greatest power individuals have is to free themselves from their government, focus on their families and economic independence.  

The tomato workers are a product of their government.  Boycotting tomatoes will just make them (and workers at Wendy's) lose their jobs.  Don't be naive.