Kuklux n. : The name adopted in the southern part of the United States by a secret political organization, active for several years after the close of the Civil War, and having for its aim the repression of the political power of the freedmen; -- called also Kuklux Klan.

Example:


Taxonomy
the Klan, Klan, The Ku Klux Klan, KKK, Klansmen, Ku Klux Klan, Klan members, murder, violence, blacks, Wade, African Americans, Alabama, states, Historian, Horn, Republicans, the organization.

Defination from the web:
... 33 says that Kennedy came up with both words, but Crowe suggested transforming κύκλος into kuklux. ...