After leaving school Gruffydd found work at a textile wholesaler in Bath, Somerset, England, and whilst there contacted and became a member of Plaid Cymru.
At Fishguard, Gruffydd's characteristic approach to political action drew notice for the first time when he tore down Union Jack bunting at a local fête.
[...] ...we formed an organization called the Anti-Sais Front, which wasn't anti-English as such, but anti-Anglicisation, and we took much of our inspiration for it from developments in the Flemish areas of Belgium, and from the French-Canadians of Quebec, where the militancy was just emerging strongly.
By July 1966 they had publicly dissociated themselves from the guerilla gestures of the Free Wales Army, seeking instead to create a political pressure group within Plaid Cymru.
They formed the Patriotic Front, setting out to recruit from the Welsh majority English-speaking populace neglected by the likes of Plaid Cymru and Cymdeithas yr Iaith Gymraeg.
"[5] However, in July 1966 Plaid Cymru leader Gwynfor Evans was elected to Westminster as MP for Carmarthen and, following this first taste of mainstream political success, the party was in no mood to accommodate the exuberant strain of uniformed militancy emerging at its fringes.
Anticipating a clampdown on their activities by Special Branch and the British authorities, the Patriots Aid Committee raised funds in support of the families of imprisoned activists.
[9] Following release from prison and subsequent exile in Ireland, Gruffydd returned to Britain and to political activity - a period documented by Class War's Ian Bone.
Held in 1983 and sponsored by the Welsh Tourist Board, it was pointed out that the festival concentrated suspiciously heavily upon various of Edward I's castles, built during the Norman conquest.