(CNN) – President Donald Trump has ordered the removal of information on slavery from national parks, according to The Washington Post .

The Post cited four people familiar with the matter.

A historic photograph at Washington’s National Gallery of Art is one item that will be removed.

The photograph is called “The Scourged Back.” It shows a formerly enslaved man named Peter Gordon in 1863.

Gordon’s back is to the camera that took the photo, showing heavy scarring from slave masters cruelly punishing him with whips.

When it was taken, the photo spread quickly in the Northern United States, shocking the people there.

According to The Post, removing information on slavery is an effort to scrub national parks of what the Trump administration calls “corrosive ideology.”

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