is pounced upon by another who starts clubbing him, and then kneels on him. The boy covers his head because he doesn't have a helmet. I take a picture of it.

Someone else is being clubbed further up the street.

A policeman yells, "Get that one." I turn to see a boy in a black sweater sprint up the street dodging diagonally away from two cops. A third cop barely intercepts him on the far sidewalk. The cop throws a block into the running kid's hip. The kid goes sailing out of sight into the lobby of a movie theatre.

I chase the crowd, which turned south at the first street. A boy is lying down on the sidewalk, handcuffed to a streetlight. The police are trying to regroup. I can see the crowd farther down the street still breaking windows, and running unchecked by police.

The police won't try to face the mob head-on while they are still in small numbers. The police in this area of the Loop are spread out along the planned parade route. They attack the stragglers from the crowd.

The Weathermen are turning cast again and breaking up into affinity groups. They split into different parts of the downtown shopping area. And we go running down the sidewalk, dodging shoppers to keep track of them.

The Weathermen are on the loose again. There were only 200 of them and a couple thousand of the cops, but they still busted out. I'm racing down the street glowing in the wonder of people's eyes.

The Weathermen are going to get it. This area is being flooded by even more sirens. They won't be able to get out. It is daylight.

I find the Boston group on State Street. They are walking the same speed as the rest of the crowd except that they have helmets and leather jackets on. They stay in a solid group. A police car is following them.

The other pedestrians don't notice them very much. They walk by in both directions. The group hesitates, then turns down a side street. The police follow.

They turn south again. and there are at least four squad cars and two motorcycles keeping up with them radioing in their locations to somewhere.

A police car stops, and four cops with helmets and clubs get out. They start walking after the group, but then reconsider and get back in their car.

The Weathermen keep on walking. They turn around corners as often as they can. They maneuver away from heavy concentrations of police.

It becomes very difficult for their police tails to stick with them. Their squad cars get caught up in intersections crowded with Saturday traffic and weekend shoppers. The Weathermen walk up one-way streets the wrong way.

The police might not have the evidence they need to arrest them all right now. A fight further up the street calls several of the cars away.