The book "Letter to Emperor Alexander on the Slave Trade" by the prominent English abolitionist William Wilberforce is an important literary work designed to defend human rights. In this letter, the author highlights the brutal practice of the slave trade and calls on Emperor Alexander to join the fight to ban this inhumane phenomenon. Due to its great depth of analysis and clear presentation of ideas, William Wilberforce's book is an important part of the history of the struggle for human rights and remains relevant even in the present times.