I am in the process of writing a research paper about how the KKK influenced California during 1920-1930s. In my research I came across a claim that Porter was current member/former member of the Klan, but nothing really concrete. I've searched my school's databases rigorously, but haven't found much more about him. Does anyone know if there is merit to these claims or was it mainly hearsay? Also, any sources or possible sources would be appreciated. Thank you guys for your time.
Not a historian, but you might look at the San Diego History Center for answers on this. They appear to have some primary sources in their collection, but specifically on this they site Kevin Starr's Material Dreams: Southern California through the 1920's (New York: Oxford University Press, 1990).
I also found a 1931 news article that mentions it, charging him with "bias to Jews, Blacks and Negroes."
Michael Newton's White Robes and Burning Crosses: A History of the Ku Klux Klan from 1866 mentions him.
You should also seek out the book Chronological Record of Los Angeles City Officials: 1850—1938 in a library. You might also look in LA newspaper archives - he was accused of being endorsed by the Klan and admitted his prior membership, so there should be something in the archives from 1928.