Portugal - 1974 Party Law

Title Article 16 Principle of Sole Affiliation
Article

16

No one may be registered simultaneously in more than one party.

Categories - Extra-parliamentary party (Members' compatibility)
Source LEGISLA??O GERAL - DECRETO-LEI N.? 595/74 DE 7 DE NOVEMBRO. http://www.igf.min-financas.pt/inflegal/bd_igf/bd_legis_geral/Leg_geral_docs/DL_594_74.htm