I recently came across Sue Blackwell (T-H-L-K-D), a short biography of a relatively unremarkable British academic. However, she has operated a website that supports (gasp) human rights for Palestinians. As a result, she has been accused (without any further evidence) of being antisemitic. That accusation (originally added to the article in 2005 by an anon IP), and her subsequent denial, represent the only two "reliable sources" in the biography, the only other citation being to a diatribe that the academic co-authored and hosts herself.

This is a persistent problem on Wikipedia: if you want to attack a (semi-)prominent person, then accuse them of antisemitism, get it printed somewhere, at which point the accusation becomes sourced, along with the denial, if any, despite the merits of the accusation. Am I the only one who sees this as a Yellow badge (T-H-L-K-D) in reverse? It is part and parcel of the outlandish position some take that any criticism of the actions of the government of Israel is evidence of a hatred of the Jewish religion.