5. The fact of permanent or temporary disability shall be certified after a medical examination by the Bureau of Medical Survey in the city, district or province, by accident insurance office or agencies representing the former, according to the place of residence of the person whose disability is to be certified. _Note I._ The rules on the method of examination of disabled workmen are appended hereto. _Note II._ Persons who are subject to compulsory labor and are not engaged in useful public work may be summoned by the local Soviets for the execution of public work, on conditions determined by the Department of Labor in agreement with the local Soviets of trade unions. 6. Labor may be performed in the form of— (_a_) Organized cooperation; (_b_) Individual personal services; (_c_) Individual special jobs. 7. Labor conditions in government (Soviet) establishments shall be regulated by tariff rules approved by the Central Soviet authorities through the People’s Commissariat of Labor. 8. Labor conditions in all establishments (Soviet, nationalized, public and private) shall be regulated by tariff rules drafted by the trade unions, in agreement with the directors or owners of establishments and enterprises, and approved by the People’s Commissariat of Labor. _Note._ In cases where it is impossible to arrive at an understanding with the directors or owners of establishments or enterprises, the tariff rules shall be drawn up by the trade unions and submitted for approval to the People’s Commissariat of Labor. 9. Labor in the form of individual personal service or in the form of individual special jobs shall be regulated by tariff rules drafted by the respective trade unions and approved by the People’s Commissariat of Labor. ARTICLE II THE RIGHT TO WORK 10. All citizens able to work have the right to employment at their vocations and for remuneration fixed for such class of work. _Note._ The District Exchange Bureaus of the Department of Labor Distribution may, by agreement with the respective unions, assign individual wage earners or groups of them to work at other trades if there is no demand for labor at the vocations of the persons in question. 11. The right to work belongs first of all to those who are subject to compulsory labor. 12. Of the classes exempt from compulsory labor, only those mentioned in subdivision “_b_” of Section 2 have a right to work. 13. Those mentioned in subdivisions “_a_” and “_c_” of Section 2 are absolutely deprived of the right to work, and those mentioned in Section 3 temporarily deprived of the right to work. 14. All persons of the female sex, and those of the male sex under 18 years of age, shall have no right to work during night time or in those branches of industry where the conditions of labor are especially hard or dangerous.