This was the Portland-area Exalted Cyclops of the KKK in the 1920s who got candidates elected and pushed out Catholics. Around 1922, Oregon politics was totally dominated by the Klan, and they even had a second resurgence in the 1930s with Gifford at the helm. /1 
What the KKK really achieved in Oregon politically was actually a public school measure that was also pushed by the progressives. Their purpose in 1922 was really to stop Catholic schools since anti-Catholicism was the primary political focus of the Klan in Oregon.
They also aligned with the progressives around eugenics, which was deemed progress on the left in that they thought it would end suffering. The 1913 sterilization bill in Oregon, which created sterilization for the "criminally insane" was supported by the Klan and progressives.
The bill was brought to referendum, and defeated six months later, by the Anti-Sterilization League, which actually included many conservatives, Catholics, and people motivated by a suspicion of medicine and vaccines. So basically some leading anti-vaxxers.
Obviously the sterilization bill became law in the end and mandatory sterilizations happened in Oregon until the program was halted in 1981. Oregon had a Board of Eugenics (though renamed at that point) until 1983.
So it was the Klan working with populist progressive groups where it made its greatest victories, and is what motivated the larger Women's KKK in Oregon, who united their nativism with support for women's rights and birth control, saying they were against reactionary minorities.
This sort of progressive mask was used heavily to attack Catholics and Jews, and many lurid stories about the abuse of nuns was rampant. This disingenuous "concern" for how Catholics treated women heavily mirrors the language used to cover ugly Islamophobia today.
The Klan heavily exploited working class white populism, using legitimate class anger and warping it to nativist interests. This is why they supported unions when they excluded non-white workers, and this evolved into the later rural populism that motivated Posse Comitatus.
