"Free Thought and Official Propaganda" is a collection of essays written by Bertrand Russell in response to the censorship and propaganda tactics employed by governments. Russell argues that these tactics suppress individual thought and intellectual freedom, and that free thought is essential for a healthy society. He examines the role of education, religion, and politics in shaping public opinion, and critiques the ways in which governments and institutions use language to manipulate and control the masses. Ultimately, Russell calls for a society in which individuals are free to think for themselves and are not subject to the influence of official propaganda. This book remains relevant today as it explores the tension between individual freedom and state power, and the importance of critical thinking in an era of misinformation and fake news.