The possibility of the general secretary of a union as a member of an organ registered in the professional association of one of the competent public entities on the subject of health being able to communicate the government organs and the affiliates to the union the agreements and its interventions in that organ registered in the professional association is brought up. The communication of data to the government organs that govern the union, in accordance with what foresees the article 11.2.c) of the LOPD, is legitimate for the purpose that he justifies it. The communication of data to the affiliates to the union is considered cession of data and would only be it legitimates in the supposition in which it was fitted out by a rule with rank of law, in accordance with what orders article 11.2 to) of the LOPD.