Became the first president of the Congress of Labor Organizations (CLO) – a trade union federation formed by Hukbalahap Guerillas in 1945. It represented a significant percentage of the organized labor force in Panay and Manila, and a dominant federation following the second world war. It was part of the Democratic Alliance party, a wing of the Partido Komunista ng Pilipinas (PKP).
Led and managed Labor Organization Activities – involved in Labor cases
At some point the Philippine Trade Union Center split with the disbanding of the CLO and arrests conducted upon its leadership. Cid found himself forming part of the Philippine Association of Free Labor Unions (PAFLU). With Roberto Oca, Ignacio Lacsina and Felixberto Olalia he would also help in creating the Lapiang Manggagawa (The Labor Party of the Philippines) in January 1963. The party however would break-up in August of the same year.
With the Declaration of Martial Law, Cid was among the first persons arrested by the regime.
 West, Lois A. (1997). Militant Labor in the Philippines. Temple University Press. p. 156. ISBN 1-56639-491-0.
 Azama, Rodney S. (April 1, 1985). “The Huks And The New People’s Army: Comparing Two Postwar Filipino Insurgencies”
 Kerkvliet, Benedict J. (1977). The Huk Rebellion: A Study of Peasant Revolt in the Philippines. University of California Press. pp. 138
 Philippine Newspaper Guild v. Evening News, 29 April 1950, GR No. L-2604.
 Sibal, Jorge V., A Century of the Philippine Labor Movement, Illawarra Unity – Journal of the Illawarra Branch of the Australian Society for the Study of Labour History, 4(1), 2004, 30. Available at:https://ro.uow.edu.au/unity/vol4/iss1/2
 Simbulan, Dante C. (2005). The Modern Principalia: The Historical Evolution of the Philippine Ruling Oligarchy. University of the Philippines Press. p. 170.