It wasn’t pictures of the Klan, but this did actually happen.

They got one home appraisal and it was suspiciously low. Then they removed anything that identified the home as being owned by black people and had someone who wasn’t black show the home to the appraiser and got a much higher appraisal.

https://www.king5.com/article/news/community/facing-race/low-home-appraisal-black-family-seattle/281-6fa15484-d9a0-434f-a3e3-c368d6324755