In early June 1970, de Melo and Zaldivar started Los Trabajadores, a tabloid, at the request of the general secretary of CTC, Hector Ramos Latour.

The original Los Trabajadores staff included de Melo, head of the Press Section of the CTC, Zaldívar, chief of information; Mario Castillo and Lucas Tarragó, journalists, and Rolando Montalván, Ángel Lazo and Rodolfo Amiama, photographers.

Guillermo Hernández managed the printing with the assistance of Orlando Núñez and workers from the newspaper El Mundo.

Initially, Trabajadores was a twelve-page tabloid with a print run of never more than three thousand copies, which was left irregularly until it could be biweekly.

Research by students of the Institute of Design (ISDI in Spanish) on early issues of Trabajadores showed that "The body text typeface had no formal or conceptual basis, as their selection was subject to the availability of types in the workshop, for holders was the Futura.

"In 1977, Trabajadores initiated the use of fillets, chain lines, and boxes to separate the news and even dabbled in infographics as a means of enriching the information.

In March 1978, the publisher reduced the number of photos on the first page; the information was ranked according to their importance and was used to separate targets.

in 2000 Alina Martínez Tria became manager and editor Trabajadores began to include agencies cables.

The paper employed a chief editor and three operators, two of them dedicated to the update in the morning, on alternate days, and the third from Tuesday to Friday afternoons, two editors who worked on alternate days, and two correctors with equal labor system which amounted to a total of eight people.