Sec. 14.

Nothing in this act shall be construed to interfere with the right of an employer to enter into an all-union agreement with 1 labor organization if it is the only organization established among his employes and recognized by him, by consent, as the representative of a majority of his employes; nor shall anything in this act be construed to interfere with the right of the employer to make an all-union agreement with more than 1 labor organization established among his employes if such organizations are recognized by him, by consent, as the representatives of a majority of his employes.