Back in 2004, someone sent a letter bomb to Don Logan, the director of the Office of Diversity and Dialogue in Scottsdale, Ariz. Logan suffered serious burns on his hands and arms, and two other people suffered minor injuries.

At the time, it was clear that both federal and local authorities wanted to treat the case as an "isolated incident" unconnected to any racial matters. The chief line of investigation was into Logan's personal background, to see if he might have had financial dealings that created enemies. Unsurprisingly, the trail went cold in short order.

Yesterday, the FBI finally arrested three white supremacists in the case:

Dennis Mahon has been a player in the white-supremacy movement for a couple of decades now:

In 1991, Mahon even embarked on a Klan/neo-Nazi recruitment tour in Europe.

Mahon claims to have befriended Timothy McVeigh when both were hanging out at Elohim City, the violent white-supremacist enclave in the Ozarks.