poor law enforcement and communications
The membership of the KKK was reportedly several million at its peak during the 1920s. However, it was a secret organization that had a self-interest in exaggerating its strength and power.
There was a claimed membership of over two million people at the height of the Klan's size in the mid-1920s.
The KKK came to an end in the 1920s through corruption from within the Klan itself and society. The Klan's more violent activities (such as lynchings, robbings, and burnings) started to offend the conscience of Americans and membership decreased. That, along with numerous accounts of fraud, sexual scandals, accusation of crimes, and money mishandling led to the demise of the KKK.
The KKK
The KKK of the 1920s was strongest in Indiana.
The "KKK of the 1920s," established in 1915, called itself the Ku Klux Klan or KKK.
KKK
The KKK actively recruited members in the 1920s. Later, Sen. Harry Byrd would become a KKK recruiter.
The biggest KKK, that of the 1920s, attracted racists, opponents of immigration, supporters of National Prohibition, Democrats, Protestants, rural residents, and people who saw themselves as patriotic. At its peak, membership across the country was claimed to be in the millions. The KKK consisted almost exclusively of white, middle-class males.
The KKK is a secret organization. However, there were KKK groups in Pennsylvania is the 1920, largely because of its staunch support of National Prohibition.
The Klan claimed to have have millions of members in the 1920s. The claimed membership numbers are always suspect because the Klan tried to exaggerate its size and power as part of it intimidation.
The KKK re-emerged in the 1920s largely but not entirely, to promote and illegally enforce National Prohibition.