Which politician led a campaign against foreign-born radicals, later called the red scare, after a bomb was mailed to his house?
a. attorney general a. mitchell palmer
b. secretary albert b. fall
c. vice president calvin coolidge
d. secretary daugherty

The best and most correct answer among the choices provided by the question is the first choice "Attorney General A. Mitchell Palmer'
Alexander Mitchell Palmer, best known as A. Mitchell Palmer, was Attorney General of the United States from 1919 to 1921. He is best known for overseeing the Palmer Raids during the Red Scare of 1919–20.

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Because the discoveries were some of the oldest human remains.