MACUSA’s primary aim was to rid the continent of Scourers, corrupt wizards who had hunted their fellow magical beings for personal gain. MACUSA’s second great law enforcement challenge was the number of wizarding criminals who had fled to America from Europe and beyond, precisely because of the lack of organised law enforcement such as existed in their own countries.
The first President of MACUSA was Josiah Jackson, a warlike wizard who was voted into post by his fellow representatives because he was considered tough enough to deal with the difficulties of the post-Salem Witch Trials era.
In these first years, MACUSA had no fixed meeting place. Meetings were held in different locations to avoid No-Maj detection.