Answer :
a)because Chinese immigrants would work for low wages, which labor leaders felt took jobs away from US citizens.
Because the Chinese immigrants were pushed into cities like San Francisco, after they worked jobs as gold miners and in the railroads, they took up low-wage jobs such as in restaurants and in laundry. The Labor movement than took this as the Chinese immigrants as taking the low-wage jobs of Americans, and since they did not use government institutions such as schools and universities, since the majority of Chinese immigrants were healthy, young men, they used this as an excuse to make an act against them.
Because the Chinese immigrants were pushed into cities like San Francisco, after they worked jobs as gold miners and in the railroads, they took up low-wage jobs such as in restaurants and in laundry. The Labor movement than took this as the Chinese immigrants as taking the low-wage jobs of Americans, and since they did not use government institutions such as schools and universities, since the majority of Chinese immigrants were healthy, young men, they used this as an excuse to make an act against them.