Perrot founded Bleun-Brug in 1905, which soon absorbed the magazine Feiz ha Breiz, which he edited after 1911. The aims of the organisation were:
to promote the Breton ideal in all three intellectual, political and economic arenas.
to contribute, as Catholics, to the return of Brittany to the full exercise of its traditional faith.
He was named vicar of Saint-Thégonnec in March 1914. On the outbreak of war he was called up at Lesneven on 5 August but he asked to leave to volunteer for the Groupe des Brancardiers Divisionnaires. He was decorated after World War I. After 1910, he played an important role in the Emsav, the Breton nationalist movement. In 1920, he was named vicar of Plouguerneau. In 1922 Yves Floc'h, the future painter worked as his parson. Perrot patronised Michel Le Noblez and organised theatrical performances. Yves Floc'h painted the scenery for a play, and his gifts were noticed by the vicar. From 1932, Perrot's secretary was Herry Caouissin. Perrot wrote countless articles and plays expressing his ideology, most notably in Feiz ha Breiz. He was initially stationed in a conservative Saint-Vougay parish, but was transferred to the more leftist area of Scrignac in 1930 by the episcopal hierarchy, who disliked his political activities. On 8 July 1941 he became part of the group of writers who adopted a unified orthography of the Breton language.
World War II
With the outbreak of war, hostility towards Perrot in Scrignac grew, as he was suspected of pro-German sympathies. On 16 October 1939 telegraphic lines in the region of Huelgoat were cut. Perrot was accused by authorities of sabotage. The gendarmes searched his estate twice and interrogated him, but he was released as he had an alibi. However, one gendarme publicly accused him of cutting the wires, and Perrot accused the gendarme of defamation. Afterwards, an enquiry established that a military prisoner was responsible for cutting the wires. At the request of the colonel of the Gendarmie of Quimper, the abbé dropped his accusation of defamation. During the war, he continued to produce Feiz ha Breiz. Braving the ban by Adolphe Duparc on celebrating nationalist anniversaries during the occupation, he organised the members of Bleun-Brug in Tréguier on the 29 and 30 August to celebrate the 500th anniversary of the death of DukeJean V of Brittany. In October 1942, he was named a member of the Comité Consultatif de Bretagne, a non-elected council put in place by Regional PrefectJean Quénette to put forward proposals relating to Breton language and culture. In July 1941, Perrot took part in the German-sponsored effort to unify the writing of Breton. Perrot sympathised strongly with the collaborationist Breton National Party. When his parsonage was partly requisitioned by the Germans, Perrot was accused of assisting them. According to Henri Fréville, on 7 August 1943 Perrot was questioned about the movements of members of Bagadou Stourm, Breton nationalist stormtroopers allied to the Nazis, who had stopped at Scrignac. He was hospitable toward the Bagadou Stourm Youth, who were most active around Finistère, where leaders such as Yann Goulet and L’Haridon had been arrested by the French police but released by the Germans.
After his death, the collaborator Célestin Lainé recruited about sixty men whom he organised under the name Bezen Kadoudal. Ael Péresse, second-in-command to Laîné, suggested naming the group after Perrot, so it became Bezen Perrot instead.
, in Bretagne et identités régionales pendant la Seconde Guerre mondiale asserts that Abbot Henri Poisson said in his book: Francis Gourvil in 1990:
Publications
Alanik al Louarn. Pe "n'euz den fin n'en deuz e goulz". Pez c'hoari plijadurus rimet e daou Arvest, Brest, Moullerez "Ar c'hourrier", 1905
Buez ar zent, Ar Gwaziou, Morlaix, 1911
R. G. Berry, Eun nozveziad reo gwenn Translation from Welsh to Breton by Geraint Dyfnallt Owen and Jean-Marie Perrot of Noson o Farrug ,. Performed by Bleun-Brug theatre company inLesneven 1928. http://bibliotheque.idbe-bzh.org/document.php?id=eun-nozveziad-reo-gwenn-18682&l=fr
Special 30th anniversary edition 1936 of Ouvres Bretonnes: http://bibliotheque.idbe-bzh.org/data/cle_52/Bulletin_de_lUnion_des_Oeuvres_Bretonnes_1936_nA78_.pdf