Critical Race Theory: An Introduction, written by Professors Richard Delgado and Jean Stefancic, was one of several books recently removed from classrooms by the Tucson Unified School District. In order to comply with Arizona state law ARS 15-112 (and to receive the $14 million in funding that would have been withheld by the state for failing to comply), the school district eliminated their very successful high school Mexican American Studies program. As part of this process, seven books (Critical Race Theory, 500 Years of Chicano History in Pictures, Message to AZTLAN, Chicano!, The History of the Mexican American Civil Rights Movement, Occupied America: A History of Chicanos, Pedagogy of the Oppressed and Rethinking Columbus) were boxed up (in at least one instance while students watched) and removed to offsite storage facilities. The District claims that this action was not a book ban, even though the books are no longer allowed to be available in the classroom and cannot be used as part of the school curriculum.
You can read a response by Professors Delgado and Stefancic on the Academe Blog.