As I mentioned the other time the Wiesenthal Center was brought up you have one group of political activists endorsing another This does nothing to establish Berlet as a reliable source in fact it underscores the problematic nature of using him as a source per WPNOTADVOCATE With respect to Newsnight the Berlet material is an interview and Wikipedia considers interviews to be primary sources which should also be avoided In an interview there is no fact checking or any of the other features that characterize a WPRS