Between 1983 and 2000 he was director of the Cultural Institute of Brittany and had an important role in the conception and publication of the collection Les Bretons au-delĂ des mers : Explorateurs et grands voyageurs (Quimper, Ed.
He strenuously denied this accusation, but made no apologies for his defence of Breton culture and language in the face of the highly centralised French state.
Several organisations also objected to local councils in Brittany disseminating free of charge, in schools, his and his wife Jacqueline's Dictionnaire des romanciers de Bretagne (Keltia Graphic, 1999), dealing with Breton novelists.
In 2010 his publishing house Les Portes du Large published a French translation of a biography of Marc-Joseph Marion Dufresne by Australian historian Edward Duyker.
Le Nail suffered a ruptured aneurysm and massive cerebral haemorrhage on 24 December 2009.