Potato salad with frankfurter or wiener-sausages is popular in some families. The word "frankfurter" comes from Frankfurt, Germany, where pork sausages similar to hot dogs originated. Kahane is a regular columnist for Berliner Zeitung and Frankfurter Rundschau. Frankfurt's youngest city district is Frankfurter Berg. Bernhard Guttmann, the editor of the "Frankfurter Zeitung" sued Chamberlain for libel about that article. Other mourners included Associate Supreme Court Justice Felix Frankfurter and former ambassador Joseph P. Kennedy. Separate concurring opinions were delivered by Justices Felix Frankfurter and Robert H. Jackson. Brandeis and Felix Frankfurter often collaborated on political issues. Burton served until 1958, often joining the conservative bloc led by Felix Frankfurter. One faction was led by Justice Hugo Black, the other by Justice Felix Frankfurter. Drucker then moved to Frankfurt, where he took a job at the Daily "Frankfurter General-Anzeiger". He was appointed Felix Frankfurter professor of law in 1993. The Swiss government refused to extradite the alleged assassin David Frankfurter to Germany. A second vacancy arose later in 1962 due to the retirement of Felix Frankfurter. An example is the frankfurter, often abbreviated as "frank".