How did the Leo Frank case result in the rise of the KKK and hate against Jews?

Historically, the Frank case has had reverberations throughout the past century. The only high-profile lynching of an American Jew, Frank's death could be felt in both the North and the South, and in both Jewish and non-Jewish communities.

Notably, two significant groups latched on to the Frank case to expand their reach nationally.

"A short time after the lynching of Leo Frank, 33 members of the group that called itself the Knights of Mary Phagan gathered on a mountaintop near Atlanta and formed the new Ku Klux Klan of Georgia," University of Missouri at Kansas City School of Law professor Douglas O. Linder wrote in a 2008 overview of the Frank case. "Meanwhile, members of an outraged Jewish community met to create the Anti-Defamation League to combat anti-Semitism.

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this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.