Several individuals and groups have drawn direct comparisons between animal cruelty and the Holocaust. The analogies began soon after the end of World War II, when literary figures, many of them Holocaust survivors, Jewish or both, began to draw parallels between the treatment of animals by humans and the treatments of prisoners in Nazi death camps. The Letter Writer, a 1968 short story by Isaac Bashevis Singer, is a literary work often cited as the seminal use of the analogy.[1] The comparison has been criticized by organizations that campaign against antisemitism, including the Anti-Defamation League (ADL) and the United States Holocaust Memorial Museum, particularly since 2006, when PETA began to make heavy use of the analogy as part of campaigns for improved animal welfare.[2]