In 1944, the novel Alcateia is seized by the censorship of the Estado Novo regime, and the same year is released the second edition of Casa na Duna.
1945 and the subsequent years will be very fruitful for Carlos de Oliveira, with his participation in the Seara Nova and Vértice magazines and collaboration on the book by Fernando Lopes Graça Marchas, Danças e Canções - a collection of poems by various poets, with compositions by Lopes Graça, songs that came to be known as "heroic".
In 1968 he published two new books of poetry, Sobre o Lado Esquerdo and Micropaisagem and collaborates with Fernando Lopes in the film adaptation of Uma Abelha na Chuva, completed in 1971.
He published in 1971 O Aprendiz de Feiticeiro, a collection of articles and chronicles, and Entre Duas Memórias, a poetry book.
He is one of the greatest poets of the 20th century combining social intervention (Neorealism) with reflection about the creative process of writing.