43. Are there limits on the amount that third parties can spend on election campaign activities?

Article 41, para 3, letter f) of the Electoral Code  nb. 1381  of 21.11.1997 (as of 29.12.2017)

It is forbidden to fund or support in any form, direct and / or indirect, the activity of political parties, initiative groups, electoral campaigns / electoral contestants by anonymous persons or on behalf of third parties;