Portugal - 1976 Constitution

Part I - Fundamental Rights and Duties - III - Economic, Social and Cultural Rights and Duties
Title Article 57
Chapter II - Economic Rights and Duties
Article

57

(4) Trade unions shall be independent of employers, the State and religious denominations and political parties and other political associations. Adequate guarantees for that independence shall be laid down by law as the foundation for the solidarity of the working classes.

Amendment Constitution: Article 56 (1982)
Categories - Extra-parliamentary party (Members' compatibility)
Source Portuguese Electoral Commission (http://www.cne.pt)