I do not have any opinion about whether Dunn Hall should be renamed at the U of O or whether Dunn was an ongoing member/ leader of the Eugene KKK.  I do strongly object to Igl's assertion that "Support for Prohibition, not racism or anti-Catholicism, was probably the number 1 issue of the 1920's KKK".  That is a major distortion of history.  See the Oregon History Society's Oregon History Project: Proclamation Against the Ku Klux Klan, 1922 written by Governor Ben Olcott on 5/13/22. Governor Alcott lost the Nov 1922 election by 57% to 43% to the Klan backed Democratic candidate Walter Pierce.  In the same election an anti-Catholic initiative was approved by Oregon voters stipulating that attendance at parochial schools did not meet the requirement for school attendance.
Besides anti-Catholic bias there was a major bias against Jewish people (ie Klan members boycotted the Meier & Frank store as it was a "Jewish store"). To ignore all this context is a gross distortion of history.