Article 388 Federal Labor Law

If within the same enterprise several labor unions exist, the following rules shall be observed:

I.If enterprise or industrial unions, or both, concur, the collective contract shall be entered into with the one that obtains the greatest number of votes of the employees within the enterprise;

II.If guild unions concur, the collective contract shall be entered into with the group of majority unions that represent the professions, provided that they reach an agreement. Otherwise, each labor union shall enter into a collective contract for its profession; and

III.If guild unions and enterprise or industry unions concur, the former may enter into a collective contract for their profession, provided that the number of employees in their favor is greater than that of the employees of the same profession who vote for the enterprise or industry union.

The vote of the employees shall be in accordance with the procedure contemplated in Article 390 Bis. The labor union or labor unions that, in accordance with the provisions of this chapter, obtain the majority of employees, as the case may be, shall obtain the corresponding Certificate of Representativeness in order to request the entering into and signing of the collective employment contract under the terms of Article 387.