Paul Krugman, the New York Times economist tells commenters on his blog that Nazi references will get them deleted:
New rule, if you haven’t seen it: Nazi/Hitler references are out unless clearly relevant. The American Gathering of Jewish Holocaust Survivors and Their Descendants approves, in an email: New York Times columnist Paul Krugman got it right in barring gratuitous references to Hitler or the Nazis in comments responding to his blog posts. As survivors, we have long spoken of the malignant impact that trivialization of the Holocaust has had on the profound implications for education, history, and memory that come from invoking the tragedy of the Shoah. This becomes particularly important in the current political climate where the propriety of what is acceptable in public discourse has come under renewed scrutiny.