The data covers the work of organisations HazteOir and CitizenGO, comprising documents which date from 2001 to 2017 like spreadsheets of donors and members, strategy and planning documents, letters, financial charts and legal and training documents. HazteOir was first founded in 2001 in Spain to campaign for right wing values, in 2013 it founded CitizenGO to spread its work beyond Spanish speaking countries.
Here is the link: https://wikileaks.org/intolerancenetwork
They are also the editors. These documents have been redacted to comply with privacy laws. As publishers, they also decide the date of publication… which in this case is quite “curious” (see my other comment).