[1][6][7][2][8][9] Shortly after the fall of the Marcos dictatorship, Tadeo was appointed to be part of the 1986 Constitutional Commission where he was the sole peasant representative.

[2] In January 1987, Tadeo figured prominently in the demonstrations which led to the Mendiola massacre, a violent dispersal of peasants, workers, and students by state security forces which left 13 dead.

[3] In 1990, Tadeo was arrested and sentenced to a maximum of 18 years in prison at the National Penitentiary in Muntinlupa for committing estafa,[11] which supporters claim was due to his outspoken criticism of Corazon Aquino's executive order on agrarian reform.

[2] Tadeo led a small group of Bulakenyo and Central Luzon farmers as head of the organization Paragos-Pilipinas.

[1][13][14] Tadeo supported the Genuine Agrarian Reform Bill filed in Congress by Representative Rafael Mariano in 2018.