Final answer:
The provided reference does not contain the necessary details to accurately complete the question regarding the origins of organized crime in Chicago that can be traced to the mayoralty election of 1873.
Step-by-step explanation:
The origins of organized crime (OC) in Chicago can be attributed to various historical events and figures. However, the specific information needed to answer the provided question about the mayoral election of 1873 is not present in the reference information. Therefore, the statement "The origins of OC in Chicago can be traced to the mayoralty election of 1873 in which ___ backed the victorious candidate for mayor." cannot be accurately completed without additional historical context or data not provided here.
It is worth noting that figures like Big Bill Thompson and his administration, as well as individuals such as Al Capone, played significant roles in the history of organized crime in Chicago. However, these figures are mentioned in reference to a much later time period than the 1873 mayoral election. The 1873 election predates the Prohibition era, during which organized crime in Chicago became particularly prominent.