 Whilst working as a teacher and academic, Streel joined "l'Action Catholique de la Jeunesse Belge" in 1930 and whilst in this organisation he became close to Léon Degrelle and Jean Denis.As such he was an early member of the Rexist movement and rose to prominence with his 1932 work, "Les Jeunes Gens et la Politique", which underlined his distaste for the modern world.Strongly influenced by Charles Maurras, the book sought to appeal to what it called the "young Catholic elite".