they're go doing it in an orderly way. many came here with the purpose of getting arrested. >> there's a difference in uniforms, light blue officers -- we can see one person taken away in handcuffs -- with the officers that are in blue from homeland security, the officer in white st. louis police, do i have that correctly, or it's the reverse? >> reporter: right. the dark blue uniforms are homeland security. i believe the officers in blue are st. louis city. i think the distinction is in terms of the force, this is federal ground. of course you're going to have city police, clearly going to have federal authorities here as well. >> we see video of cornell west. i want to make sure viewers caught that moment. explain the crowds. you had talked about the diversity of the crowds. here's the other amazing thing that we're seeing. the police on the right-hand side getting cornell west's