Twenty-five officers-some carrying unloaded shotguns-surrounded each of the houses before the raids. There was no scuffling at the arests, which took about 20 minutes.

Police had search warrants for all the raids. Sergeant James Roscoe said the police spent the day getting warrants and arranging the raids.

Police found a variety of weapons-including one loaded shotgun, one loaded rifle with a bayonet, two other rifles, pipes, sticks, window weights and 800 rounds of ammunition-in a closet at the Franklin St. house. Police said one of the rifles was stolen.

Roscoe said that the police informant had been an eyewitness to both the shooting incident and the alleged conspiracy. Police refuse to identify him, but say he is a juvenile.

The informant "was frightened by the thirst for blood, the talk of 'pigs' and overthrowing the government," Roscoe said.

The group reportedly includes almost all the Weathermen in the Boston area.

Those arrested were: Alan P. Wilson. 19; Mark S. Gedal. 19; Lyndin David Smith, 22; Gregg R. Wolfong. 25; Gary B. Kazin, 18; Arthur 1. Handler, 20; William L. Geogran, 22; James K. Kilpatrick, 22; James H. Reeves, 21; Henry Olson, 28; Thomas B. Cook, 23; Neil Birnbaum, 24; Marshall B. Berzon, 18; and Phillip C. Nies, 20.

Also Juanito Duffy, 19; Marion Fienberg, 21; Meg Raymond, 22; Janet Press, 18; Nancy Gretsky, 22; Enid Sippen, 21; Jill Wattenberg, 20; Vicky Gahiner, 27; and Susan Hagedorn, 24.

All listed their addresses as one of the three raided houses.