People don’t realize now how HUGE the Klan was then in it’s second emergence, and not just in the South. I think Indiana had the most members at the time.
The Democratic Convention of 1924
Newspapers called the convention a “Klanbake,” as pro-Klan and anti-Klan delegates wrangled bitterly over the party platform. The convention opened on a Monday and by Thursday night, after 61 ballots, the convention was deadlocked. The next day, July 4, some 20,000 Klan supporters wearing white hoods and robes held a picnic in New Jersey. One speaker denounced the “clownvention in Jew York.” They threw baseballs at an effigy of Al Smith. A cross-burning culminated the event.
http://www.digitalhistory.uh.edu/disp_textbook.cfm?smtID=2&psid=3393