have countersigned
Present perfectconjugation ofcountersign.There are other translations for this conjugation.

countersign

Many organizations of Free Thought have countersigned this Declaration, which honours human conscience, the one that will never fold under the bushel of barbarism and the horror of war.
Numerosas organizaciones de Libres pensadores firmaron esta declaración que honra la consciencia humana, esta consciencia que nunca se doblegará bajo el yugo de la barbarie y el horror de la guerra.
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