On May 1, 2006, neo-nazist Národní odpor ("National Resistance") announced a demonstration on Palacký Square in Prague, which wasn't banned by the authorities despite human rights activists' objections. A group of Green Party members participated in the protest actions at the place guarded by police, which separated neo-nazis and their opponents. When they followed departing National Resistance members to Karlovo náměstí, Jacques got into conflict with the police officer Tomáš Čermák from the local police department, which had relieved hoplites from special police forces. Čermák claims that he used compulsory means (when arresting her), when Jacques did not comply to his prompts to stop provoking violence; according to her and several witnesses, she was beaten without justification, however these claims were disputed. Following the incident, one photographer was detained and escorted to a police station.