Bobert, I seem to remember that SDS started quite nonviolently, exercising civil disobedience much as MLK, SCLC, and SNCC did. However, about 1969 it morphed into the Weathermen and the Weather Underground (currently a weather forecasting service spun off by the meteorology department of the U. of Michigan). Those folks were NOT non-violently inclined and I believe some are still in jail. I'd quote from sources like Abby Hoffman's "Steal This Book" only someone stole my copy (really!) or "Revolution for the Hell of It" but that also was ripped off.

Pigs don't represent State power as an abstract principle; they are a power that we will have to overcome in the course of struggle or become irrelevant, revisionist, or dead. We must prepare concretely to meet their power because our job is to defeat the pigs and the army, and organize on that basis. Our beginnings should stress
self-defense—building defense groups around karate classes, learning how to move on the street and around the neighborhood, medical training, popularizing and moving toward (according to necessity) armed self-defense, all the time honoring and putting forth the principle that "political power comes out of the barrel of a gun." These self-defense groups would initiate pig surveillance patrols, visits to the pig station and courts when someone is busted, etc.

--from You Don't Need A Weatherman To Know Which Way The Wind Blows by Karin Asbley, Bill Ayers, Bernardine Dohrn, John
Jacobs, Jeff Jones, Gerry Long, Home Machtinger, Jim Mellen, Terry Robbins, Mark Rudd and Steve Tappis. Published in "New Left Notes", June 18, 1969.