This is a general question about available resources, as a Google search and a search of the FamilySearch wiki weren't really yielding any results. I'm interested in finding out if there are any records of Ku Klux Klan membership existing in the United States. I know there are some records concerning Klan leaders, but I'm specifically interested in finding out if there are membership lists/indexes/applications, etc. that might confirm/disprove my ancestor's involvement with this rather awful organization.
Here's what I know: my grandmother was told by her mother that my great-great grandfather, Roy Travis Wilson, was a member of the Ku Klux Klan. My grandmother and I went to visit one of my grandmother's cousins to look at old pictures when I was probably 15 and her cousin reiterated this fact. She even told us an anecdote about how, after my great-great grandfather Roy had passed away, the Klan came and donated food to his widow's family.
My great-great grandfather Roy Travis Wilson was born on 27 May 1899 in Springfield, Clark, Ohio. He lived between Springfield and Anderson, Madison, Indiana and worked as a railroad driver for the International Harvester Company. He married my great-great grandmother on 10 Sep 1921 in Madison County, Indiana. He had to undergo an operation due to a head/brain injury (mastoid operation) after which he passed away, due to meningitis on 11 Dec 1923 in Anderson, Indiana.
I also know that the KKK had a presence both in Springfield, Ohio and in Anderson, Indiana. I currently live in Anderson, and was able to look for local history resources pertaining to this subject. I found one book on the organization in Anderson, which contained several newspaper clippings, but I was not able to locate a mention of my great-great grandfather. I found an old photograph online of a KKK parade in Springfield, Ohio at approximately the time my ancestor would have lived there.
What I would like to find out: Was my ancestor actually a member of this organization? Are there any records existing that might shed light on my ancestor's involvement in this organization?
I found an old application for membership (blank) to the KKK from the early 20th century. It contained a lot of important information that would be useful to my genealogical research, so if membership information is available, not only would this provide an interesting (albeit unfortunate) fact to add to my family tree, but it would also perhaps lead to other records that might further flesh out my ancestor's life.