2. This Act has effect notwithstanding any provision of an agreement, an individual employment contract, a collective agreement within the meaning of paragraph d of section 1 of the Labour Code (chapter C-27), a decree made under the Act respecting collective agreement decrees (chapter D-2), a collective agreement made pursuant to the Act respecting labour relations, vocational training and manpower management in the construction industry (chapter R-20) and any other agreement respecting conditions of employment, including a government regulation giving effect thereto.