06 January 1999,
Disguised as Reyes Magos, they chained themselves on the outskirts of the Spanish Congress calling in Madrid for the Basque repatriation of Basque prisoners. Solidarity with the prisoners were members of the group and brought coal to the Madrid authorities because they did not comply with the law on prison policy with the Basque political prisoners.
Source:
Kings defend the rights of prisoners. Euskaldunon Egunkaria (7 January 1999)