KICK boxers are planning to march on the Independent Commission Against Corruption's Admiralty headquarters in an effort to clear the name of the Hong Kong Boxing Association and its chairman, sacked ICAC deputy operations director Alex Tsui Ka-kit. The group's executive committee not only wanted to show support for Mr Tsui, who was sacked last month, but also rebuild its own image. Sources on the association's executive committee said police had given approval to the sit-in on New Year's Day outside the ICAC's Murray Road offices, but stressed the action would be peaceful. ''We don't know why or what happened. Alex Tsui always kept his voluntary work for us separate from his professional life,'' one committee member said. ''We do believe that certain people are trying to tarnish the good people who work for the association and we want to show that we are good, law-abiding people, who train good kids. ''Our sport is developing and we want to continue that.'' ICAC Commissioner Bertrand de Speville has used the ICAC Ordinance's secrecy provisions to keep the reasons for Mr Tsui's dismissal under wraps. Within days of the sacking, the Thai boxing committee met to consider Mr Tsui's future and issued a strong statement in his defence, saying he had worked to clean up the sport. The association, recognised by the Government and affiliated internationally, had been working actively for more than a year to dissociate itself from the Hong Kong and Macau Muay Thai Boxing Council, which also runs Thai boxing tournaments. One gymnasium owner and one referee prominent in the council are facing charges related to membership of the Sun Yee On triad society. The council last held a joint tournament with the association in March 1992 but formerly split later that year. ICAC operations director Jim Buckle said the police had informed him of the likelihood of the march, but said it would be left up to the police to handle. ''If they wish to give us a petition we shall receive it. We're manned 24 hours so there will be someone there to collect anything,'' he said. Mr Tsui declined to comment on the march.