Take a look at this! They could not come up with a real white supremacist group, so they hoaxed one. The heat became too much and they bugged out in rental trucks.
First, three FBI agents. Look at the style of their pants (not the color, the style) and the style of their shirts. That's their uniform.
Now look at this video (which is disturbing on many levels) of them marching as the "white supremacist group" Patriot Front. Look at the clothing style, look at their body types, they are clearly all field active FBI agents. From the body types alone (zero beer bellies) these are clearly not any civilian based group: