Progressive Labor Party's LP’s original concept of participation in the trade-union movement was exactly borrowed from the Communist Party USA. This meant slow clandestine work in union committees and in alliance with supposedly progressive union leaders like Harry Bridges of the ILWU, Leon Davis of the 1199 and David Livingston of District 65 in New York. All of the PLM’s trade-union cadre were ex-CP’ers, white and mostly middle aged, in their forties and older. They were not inclined to any bold moves, were not in basic industry and were generally not together in a concentration. The one exception was a small group of New York City railroad workers, led by Wally Linder. However, when he was laid off in 1963 the base and membership of PL in railroads dried up and Linder became a full-time PL functionary, “the trade-union organizer.” Generally this not impressive trade union base (Considering he was N.Y. State trade union organizer for the CP, Rosen did not take much with him into PLM.) was either dying out (literally) or quitting by 1965. When Clayton Van Lydegraf and Coe quit in late 1966 they took better than one-third of the trade-union cadre with them.
- Tom Harkin
- Homer Jack
- Seymour Melman, co-chairman
- William Winpisinger, co-chairman - president of the International Association of Machinists and Aerospace Workers
- Ramsey Clark
- William Davidon
- Jerome Frank
- David Livingston
- Robert Maslow
- Joseph Miller
- Michael Moffitt, IPS
- Robert K. Musil
- Leon Quat
- Marcus Raskin
- Rep. Fred Richmond
- Alex Rosenberg
- Morton Stavis
- Edith Tiger
- Sr. Mary Luke Tobin
- Kosta Tsipis
- Rep. Ted Weiss
Joined DSOC in response to Reagan
At the the Fifth Annual Convention of the Democratic Socialist Organizing Committee held in Philadelphia May 22-25, 1981, 17 nationally known labor leaders, political figures and intellectuals declared that they had joined DSOC "since the election of Ronald Reagan. They called upon others to do likewise becáuse "we believe that the 'dominance of corporate priorities within America and the world must be challenged by democratization of economic power in this and every other society'.
Among the signers were David Livingston, president of District 65, UAW; Moe Foner, executive secretary of District 1199, National Union of Hospital and Health Care Employees; Charles O'Leary, president of the Maine AFL-CIO and David McTeague , Democratic National Committee. 
Greeting the Peace Marchers
The Great Peace Marchers arrived in New York, October 23 1986, after trekking 3,500 miles with their message of global nuclear disarmament.
They were greeted at the George Washington Bridge by Mark Green, Democratic candidate for Senate, David Dinkins, Manhattan Borough president, David Livingston, president of District 65 UAW, Assemblymembers David Paterson and Jerrold Nadler, and City Council members Ruth Messinger, Miriam Friedlander, Carolyn Maloney and Stanley Michaels.
The family of "democratic socialism ... suffered many losses" in 1995. Among the comrades who died were David Livingston, the retired president of United Auto Workers District 65, who received New York DSA's Eugene V. Debs/ Norman Thomas Award in 1990; and Cleveland Robinson, who was also a leader of District 65 for many years. Martin Luther King, Jr. once called District 65 "the conscience of the labor movement".
- [https://www.marxists.org/history/erol/1960-1970/5retreats/chapter5.htm%7CJim Dann and Hari Dillon The Five Retreats: A History of the Failure of the Progressive Labor Party CHAPTER 5: RETREAT FROM THE TRADE-UNION MOVEMENT 1969-1971]
- SANE letterhead May, 1978
- Peoples Daily World, DSOC meet urge butter not guns, Margrit Pitman, June 11 1981
- PDW Oct. 23. 1986, page 3, 'Full schedule in NYC for peace marchers' by Richard Hoyen
- Dem. Left, Sept./Oct 1995, page 41