The topic of this paper is the censorship of children's literature in American public and school libraries. The introductory part of this paper will explain the concept of censorship, its historical development, the role of librarians in censorship and the influence of censorship on American society as a whole. Censorship is explained based on works of children's literature that were popular during the twentieth century. The reader will get acquainted with legal standards and court rulings that have had a significant impact on the concept of censorship. The aim and purpose of the work is to point out the problem of censorship in children's literature on American soil and market. Libraries are shown, their awareness of the problem of censorship and how and in what way they deal with this problem. The paper presents the procedure for disputing books and explains the procedure by which the user can achieve official communication with the library if he wants to start the procedure for disputing books. The reader will be familiar with the types of censorship and works that have been censored throughout history in the USA. Special attention in the paper is directed to the Banned Books Week, which has been held in the United States of America for several years. The research part of the paper presents the research of posts on social networks Facebook and Instagram during the Banned Books Week of five public libraries located in the Federal State of California.