Yes. Similar to the market for racist advertising caricatures in postal history.
Edit: US Japanese Internment Camp and processing is very collectible as well and does not seem to get the hatred as is shown towards the Nazi and KKK subjects today. Perhaps unlike the other topics Internment postal history results from something the US Government, put in place by A Democrat POTUS, not overruled by a Democrat majority US Congress, nor at first overruled by a SCOTUS (three did dissenting) with all nine Justices appointed by a Democrat POTUS and approved by a Democrat majority Senate.
Quote:
In 1983, a pro bono legal team with new evidence re-opened the 40-year-old case in a federal district court on the basis of government misconduct. They showed that the government's legal team had intentionally suppressed or destroyed evidence from government intelligence agencies reporting that Japanese Americans posed no military threat to the U.S. The official reports, including those from the FBI under J. Edgar Hoover, were not presented in court. On November 10, 1983, a federal judge overturned Korematsu's conviction in the same San Francisco courthouse where he had been convicted as a young man.
The district court ruling cleared Korematsu's name, but the Supreme Court decision still stands.
Federal Judge Marilyn Hall Patel, appointed by POTUS Carter was the judge who ordered the overturning of conviction.
Sadly even modern history seems to be erased or cancelled when it does not suit certain groups.
I have heard and seen outrage about the racist caricatures and KKK (early and late) being shown, sold or listed, but not one word of outrage nor concern about the documents of Japanese Internment, an action which impacted many friends of mine and countless others through the USA.