LEGISLATION is being considered to protect trade union members against unreasonable dismissal. The laws would require employers to prove that they did not sack a unionist simply because of union membership. The measures were revealed yesterday, Labour Day, by the Assistant Commissioner of the Labour Department, Alfred Chan Wing-kit. ''The proposals would safeguard the interests of workers as well as their leaders,'' Mr Chan said. ''If workers consider their dismissal is due to participation in union activities, they can ask for compensation. ''And the employers have to prove that they did not sack a worker because he participated in union activities.'' He said the Government was considering the appropriate level of compensation. His comments came as union leaders called for the right to negotiate for collective interests, as their counterparts overseas do. ''If union leaders are challenged with the danger of being sacked, how can they continue to fight?'' Lee Cheuk-yan, the chief executive of the Hong Kong Confederation of Trade Unions, said at the City Forum. Under existing legislation it was difficult for workers to prove that their employers were discriminating against union leaders, he said. Hong Kong Federation of Trade Unions vice-chairman Leung Fu-wah said amending the law was the only way to reverse the situation. Another veteran unionist, Lau Chin-shek, said the right of collective bargaining should be introduced to make sure no employees were discriminated against. Also yesterday, the business-dominated Liberal Party set up a 200-strong taskforce to fight for the interests of the labour community. The party denied the establishment of the Labour Functional Constituency Office was aimed at winning grassroots support, following the announcement that the United Democrats and Meeting Point were to merge to form a new party. ''We are doing what we have promised in our manifesto since the founding of our party [last year]. We just hope to talk with more grass-roots people,'' said party chairman Allen Lee Peng-fei. However, taskforce members were not confident they would be able to alleviate the grievances of disgruntled employees. ''Our party is dominated by businessmen. Many people may not accept our special force. Even my family was surprised at its establishment,'' chairman Lai Chung-tat said at the opening of the new office. He said the new office, subordinate to the party, would act according to party instructions although he thought the office would not ask for a review of employment legislation.