Wright v. Warner Books, Inc.
Wright v. Warner Books (1991) was a case in which the widow of the author Richard Wright (1908–1960) claimed that his biographer, the poet and writer Margaret Walker (1915–1998), had infringed copyright by using content from some of Wright's unpublished letters and journals.
Source: Wikipedia — Wright v. Warner Books, Inc. (CC BY-SA 4.0)