Filmed during the Salvadoran civil war, La luz que te decía documents the struggles of the country’s labor and trade union movement amid escalating political violence. Through strike footage, congress meetings, marches, and first-person testimonies, the film portrays a society marked by state repression, workers’ mobilization, and efforts to build national and international solidarity. The documentary pays particular attention to the strike of the National Water Authority workers (ANDA), featuring members of the SETA union who describe the causes of the protest, the repression they faced, and the survival strategies adopted during the conflict. Testimonies from other unions, grassroots organizations, and international labor groups broaden the film’s perspective beyond a single labor dispute.