A Democratic Party legislator has threatened to report provisional legislator Wong Siu-yee to the police for opening an office under his formal title. Andrew Cheng Kar-foo said he was considering reporting Mr Wong for breaching the Societies Ordinance, and urged the Government to take action. The United Front Against the Provisional Legislature - of which Mr Cheng is a member - said the inaction was 'a dark page of the history of Hong Kong's rule of law'. 'Provisional legislature members have openly challenged the spirit of the territory's rule of law and the Government's authority,' the group said. Mr Cheng said the United Front had urged Governor Chris Patten to act. Mr Patten said a complaint had to be made first. 'Anybody who acts to set up an organisation in Hong Kong has to operate within the terms of the Societies Ordinance and if anybody has a complaint about how somebody is acting, they should put it to the police,' he said. But Mr Cheng said of the Government: 'Is it an ostrich or a paper tiger? The Letters Patent state there is only one legislature in Hong Kong. 'Why does the Government not take the initiative to seek legal advice as to whether it can file an injunction to ban the setting up of such an office and its operation?' Mr Wong said those who questioned his setting up of an office should produce evidence he had acted illegally. 'If they consider I have breached the law, why don't they come here [and challenge it]?' he said. Provisional legislature president Rita Fan Hsu Lai-tai backed Mr Wong. 'I was given to understand this is within the law. But if there is any challenge at all, by all means challenge.' The Frontier's Leung Yiu-chung said of Mr Wong: 'These people are just trying to become stars so China will give them a more important position. We should just ignore him.'