The JDO has adopted a tactic of pressuring hotels and other public facilities to cancel meetings sponsored by anti-Semites such as David Duke. In early 2004, the JDO waged a phone-in campaign to pressure a Florida company to remove billboard messages sponsored by the National Alliance, an organization widely regarded as neo-Nazi. In September 2006 Columbia University scrapped plans for an address by Iranian President Mahmoud Ahmadinejad because of security and logistical problems. The move came as the JDO expressed outrage that the hard-line leader had been invited to speak.