ILO Convention No. 135 (1971) concerns protection of workers' representatives in the undertaking and facilities to be afforded to them. Workers' representatives recognized as such under national law or practice shall be protected against any prejudicial act, including dismissal, based on their status. This protection covers their activities as workers' representatives, union membership or participation in union activities, in conformity with existing laws or collective agreements or other jointly agreed arrangements. They shall be afforded facilities in the undertaking to enable them to carry out their functions promptly and efficiently; the granting of such facilities shall not impair the efficient operation of the undertaking. Effect may be given to the Convention through national laws or regulations, collective agreements or in any other manner consistent with national practice. See: Collective bargaining; Trade union. Workers' rights: Workers' rights were referred to in the Treaty of Rome (1957), which obliged the European Communities Member States to promote the improvement of living and working conditions for workers, and required them to collaborate on a number of questions relating to employment. Most European Communities activities have been devoted to improving working conditions through the implementation of several directives on occupational health and safety Other directives relate to the principle of freedom of movement. Restrictions on free movement can be applied by the Member States only on grounds of a risk to public order, safety or health, or where jobs are in a particular sector of public administration. Persistent efforts by the European Commission to establish workers' participation in company decision-making achieved success with the signing of the Charter of Fundamental Social Rights of Workers (1989). Workers' rights are also prominent in the Charter of Fundamental Rights proclaimed in December 2000. See: Safety, Hygiene and Health Protection at Work SAFE Programme; Charter of Fundamental Rights of the European Union; Charter of Fundamental Social Rights of Workers; European Foundation for the Improvement of Living and Working Conditions