Later in his life, Herzog became active in the civil resistance movement against the military dictatorship in Brazil, as a member of the Brazilian Communist Party (Portuguese: Partido Comunista Brasileiro - PCB).
Kasnije u svom životu, Herzog je postao aktivan u civilnom pokretu otpora protiv vojne diktature u Brazilu, kao član Brazilske Komunističke partije (Portugalski: Partido Comunista Brasileiro - PCB).