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Three officers were fired this week from the Wilmington, North Carolina police department after dash cam footage revealed horrifically racist conversations between them.

But before we delve into that, let's look at a brief timeline of select white supremacist incidents in police departments across the U.S.—and the FBI warning that came in the middle of them—to add some context to this story.

In 1991, a group of Los Angeles sheriff's deputies were discovered to be part of a "neo-Nazi, white supremacist gang" known as The Vikings—membership that department officials knew about and did nothing to address.

In 1999, an unknown number of officers in three different Cleveland, Ohio police districts were found to have scrawled racist or Nazi graffiti throughout police quarters, including restrooms and locker rooms.

In 2001, two officers in Williamson County, Texas were fired after they were discovered to be members of the Ku Klux Klan.

In 2006, the FBI detailed the specific threat of white supremacists purposefully infiltrating police departments. Though largely (and frustratingly) redacted, an intelligence bulletin describes how white nationalists and skinheads try to blend into police departments by hiding their true beliefs (a practice known as "ghost skinning") with the purpose of disrupting investigations into supremacist groups and recruiting other white supremacists.