It included liberals and unionist in its meaning of "un-American". The House Un-American Activities Committee (HUAC) was made in 1938 to examine charged traitorousness and subversive exercises with respect to private natives, open workers, and those associations associated with having Communist ties.
Americans hated President Hoover. They believed that he was the source of all of their misfortune. To top off their hatred, Hoover refused to get the government involved in kickstarting the economy.
I googled it and it said 50-100 billion
