Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

In the NBC footage, I found the guy covering up Ruby's head. In the first frame, you can see that he's got something in his left hand, and he is going to push it down over Ruby's head, which you can see in the next frame. Then after that, the swarm of men, without direction, are going to hustle Ruby into the building without stopping to cuff him. So, that they knew to do that means it must have been planned in advance. Look at the upper right corner of the images.