The Grapes of Wrath
The landowners blame the banks when they kick tenant farmers off of the land. They refer to the banks as being part of the "monster"; they are machines who are starving for money. While we don't exactly get to know the faces and people behind the "monster," we know they are greedy, selfish, cruel, and scared of the growing desperation among the migrant worker community. It is because of the blanks that the Joads lose their land and head to California.