E/C.12/GC/18 page 10 the equal enjoyment or exercise of economic, social and cultural rights constitutes a violation of the Covenant. The principle of non-discrimination mentioned in article 2, paragraph 2, of the Covenant is immediately applicable and is neither subject to progressive implementation nor dependent on available resources. It is directly applicable to all aspects of the right to work. The failure of States parties to take into account their legal obligations regarding the right to work when entering into bilateral or multilateral agreements with other States, international organizations and other entities such as multinational entities constitutes a violation of their obligation to respect the right to work. 34. As for all other rights in the Covenant, there is a strong presumption that retrogressive measures taken in relation to the right to work are not permissible. Such retrogressive measures include, inter alia, denial of access to employment to particular individuals or groups, whether such discrimination is based on legislation or practice, abrogation or suspension of the legislation necessary for the exercise of the right to work or the adoption of laws or policies that are manifestly incompatible with international legal obligations relating to the right to work. An example would be the institution of forced labour or the abrogation of legislation protecting the employee against unlawful dismissal. Such measures would constitute a violation of States parties’ obligation to respect the right to work. Violations of the obligation to protect 35. Violations of the obligation to protect follow from the failure of States parties to take all necessary measures to safeguard persons within their jurisdiction from infringements of the right to work by third parties. They include omissions such as the failure to regulate the activities of individuals, groups or corporations so as to prevent them from violating the right to work of others; or the failure to protect workers against unlawful dismissal. Violations of the obligation to fulfil 36. Violations of the obligation to fulfil occur through the failure of States parties to take all necessary steps to ensure the realization of the right to work. Examples include the failure to adopt or implement a national employment policy designed to ensure the right to work for everyone; insufficient expenditure or misallocation of public funds which results in the non-enjoyment of the right to work by individuals or groups, particularly the disadvantaged and marginalized; the failure to monitor the realization of the right to work at the national level, for example, by identifying right-to-work indicators and benchmarks; and the failure to implement technical and vocational training programmes. V. IMPLEMENTATION AT THE NATIONAL LEVEL 37. In accordance with article 2, paragraph 1, of the Covenant, States parties are required to utilize “all appropriate means, including particularly the adoption of legislative measures” for the implementation of their Covenant obligations. Every State party has a margin of discretion in assessing which measures are most suitable to meet its specific circumstances. The Covenant, however, clearly imposes a duty on each State party to take whatever steps are necessary to ensure that everyone is protected from unemployment and insecurity in employment and can enjoy the right to work as soon as possible.