William Hale Thompson was the Mayor of Chicago during the riot Violence , and a game Competition of brinksmanship with Illinois Governor Frank Lowden may have exacerbated Cause_change_of_position_on_a_scale the riot Violence since Thompson refused Agree_or_refuse_to_act to ask Request Lowden to send Sending in the Illinois National Guard for four days , despite Lowden having ensured Preventing_or_letting that the guardsmen were called up , organized Arranging in Chicago 's armories and made Action ready GetReady to intervene .