Later, in 1938, Howell was sent to a mental asylum in Kingston called the Bellevue Aslyum after being certified as insane for the inflammatory statements he published in his book "The Promised Key". In this publication, which was released while Howell was still incarcerated, he labeled the Roman Catholic Pope as "Satan the Devil" and created the impression that war was being declared against colonialism and white supremacy - which Howell asserted should be replaced with "Black supremacy." Furthermore, he openly objected to locally created religious systems like Revivalism and Obeah, a Jamaican folk practice. Although small, the book was powerful and very popular to the dismay of the Jamaican government.