Former Wizard of the KKK: "not voting for Trump is treason to your heritage"

Earlier this year, David Duke, a former grand wizard of the Knights of the Ku Klux Klan, backed the real estate mogul, telling his white, bigoted followers that not voting for trump was “treason to your heritage.” Trump eventually disavowed the endorsment — but only after repeatedly refusing to, claiming he didn’t know anything about the white supremacist group.
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'White elevators' sign spotted at Republican National Convention

Were the signs put up by the KKK or White Supremicist Republicans?

It's likely something like that because it has been this way ever since I was 4 years old in 1952 and before.