Google "KKK and prohibition" and see some stuff. The extent extent of collaboration is evidentally debated re https://www.jstor.org/stable/25144510?seq=1v, but certainly there was alignment.
Certainly the KKK couldn't have been the earliest to push prohibition. It's important to remember that the 1880s and 1920s KKK were almost separate organizations: the original largely disbanded because "mission accomplished", with the end of reconstruction and imposition of Jim Crow. The 1920s iteration was a much more national organization kicked off by "The Birth of a Nation". This was also the peak of Social Darwinism, and racism being not only acceptable but fashionable among northern intellectuals.
So the new KKK couldn't help but be late to the temperance party, but it fit in with the overall milieu. A gentile KKK fashionable to northern and southern elites is rather separate from the low-class Appalachian moonshiners and bootleggers whose descendants we stereotype as the most angrily racist today.
Certainly the KKK couldn't have been the earliest to push prohibition. It's important to remember that the 1880s and 1920s KKK were almost separate organizations: the original largely disbanded because "mission accomplished", with the end of reconstruction and imposition of Jim Crow. The 1920s iteration was a much more national organization kicked off by "The Birth of a Nation". This was also the peak of Social Darwinism, and racism being not only acceptable but fashionable among northern intellectuals.
So the new KKK couldn't help but be late to the temperance party, but it fit in with the overall milieu. A gentile KKK fashionable to northern and southern elites is rather separate from the low-class Appalachian moonshiners and bootleggers whose descendants we stereotype as the most angrily racist today.