5. Is there a ban on donations from Trade Unions to political parties?

Organic Law No. 16 of 2014 of May 26, 2014, on Elections and Referenda as revised and completed by Organic Law No. 7 of 2017 dated February 14, 2017, and The Basic Law No. 76 of 2019 dated August 30, 2019,  Article 77:

Private funding means all cash or in-kind funding whose source is derived from outside the candidate list, candidate or party.

The campaign of a candidate list, candidate or party can only be funded by natural persons, with a maximum of twenty times the mandatory minimum wage per person for non-farming sectors in legislative elections, and thirty times in presidential elections and referendums, for each candidate list, candidate or party.