The word forjaban is the imperfect form of forjar in the third person plural.
See the full forjar conjugation

forjar

Las alianzas se forjaban durante el día por hombres y mujeres con estudios.
Alliances were forged in daylight by men and women of learning.
De esta manera, forjaban un pensamiento positivo.
In this way, positive thinking was forged.
Dirigiéndose especialmente a los cinco nuevos miembros, el orador agregó que dicha influencia dependía de cómo los miembros forjaban su autoridad y credibilidad respectivas en los debates del Consejo.
Directing his comments to the incoming five, he added that such an influence depended upon how members built their respective authority and credibility in the Council's debates.
Las costureras inmigrantes de Nueva York forjaban una poderosa fuerza consciente de clase en contra de la brutalidad del sistema, con su experiencia en otros países y el vigoroso trabajo de organización de los revolucionarios y los socialistas.
The immigrant garment workers of New York were being forged--by the brutality of the system, by their experience in many countries, by the active organizing of revolutionaries and socialists--into a powerful class conscious force.
Las espadas islámicas se forjaban con acero sirio, considerado uno de los mejores.
Islamic swords were forged from Syrian steel, which was considered one of the best available.
Era una labor difícil, que podía llevarse a cabo si se forjaban nuevas asociaciones y se arbitraban nuevos caminos.
It was a difficult task, which could be achieved if new partnerships were forged and new ways found.
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