6. Is there a ban on donations from Trade Unions to candidates?

Article 2:
A trade union is a non-entrepreneurial (non-commercial) legal entity established by the Civil Code of Georgia, defined by its activities, - a voluntary public association (organization) of persons (workers) related to common industrial and professional interests, the purpose of which is to protect the labor, socio-economic and legal rights of trade union members as well as to advocate for their interests through protection and representation.
Source: საქართველოს ორგანული კანონი „პროფესიული კავშირების შესახებ“, მე-2 მუხლი, 1 პუნქტი. 
[Article 2 (1), Law on Trade Unions, 1998]

Article 26:
Donations may not be accepted from:
Non-entrepreneurial (non-commercial) legal persons and religious organisations, except for the organisation of lectures, workshops and other related public activities.
Source: საქართველოს ორგანული კანონი „მოქალაქეთა პოლიტიკური გაერთიანებების შესახებ“, 26-ე მუხლი, 1 პუნქტის, „გ“ ქვეპუნქტი, 1997 
[Article 26 (1, c), Organic Law of Georgia on Political Associations of Citizens, 1997].

As per Georgian law, Trade Unions are assigned non-commercial legal status, and non-commercial legal entities are prohibited from making political donations.