His goods were sequestrated by bailiffs and he was twice imprisoned in the early 1960s for refusing to pay his income tax. Meanwhile in the 1950s he joined the Quakers at Milford Haven. Williams's volume of poetry Dail Pren (Leaves of the Tree) was published in 1956 by Gwasg Gomer. It has been described as the most outstanding work of Welsh language poetry published since 1945. By the 1950s, partly influenced by his friend D. J. Williams, he had become a supporter of Plaid Cymru and stood for it as a parliamentary candidate in the Pembrokeshire constituency at the 1959 General Election, winning 4.32 per cent (2,253) of the votes. In the late 1960s, Williams taught Welsh to children of 10–11 at the Holy Name Catholic School, Fishguard, Pembrokeshire. He is said to have been a mesmerising teacher, passionate and enthusiastic, who used wooden silhouettes of farm animals with their names painted in Welsh on one side. Death and legacy Williams died in 1971 at St Thomas's Hospital, Haverfordwest, and was buried at Blaenconin Chapel burial ground in Llandissilio. There is a memorial at Rhos-fach, near to his childhood home in Mynachlog-ddu. In 2019, Waldo Williams Primary School in Haverfordwest was named in his honour. The Waldo Williams room at Friends House, London, UK is named after him. Poetry Waldo Williams's poetry shows many influences, ranging from William Wordsworth and Walt Whitman to Welsh hymns and the strict alliterative metres of traditional Welsh poetry, known as cynghanedd. Waldo Williams belonged primarily to a Welsh tradition of the or folk poets who served a locality by recording its life and people in verse, but he was also inspired by a mystic revelation experienced in his youth about the unity of humankind. This drew on the cooperative, harmonious living he witnessed in the farming communities in the Preseli Hills and reflected feelings of belonging, knowing and desiring that people live together in peace – constant themes in his poetry. This revelation inspired some of his greatest poetry, including "Mewn dau gae" (In two fields, 1956), perhaps his greatest of all. Other well-known poems of his include "Cofio" (Remembering, 1931), "Y tangnefeddwyr" (The peacemakers, 1941), "Preseli" (1946), and "Pa beth yw dyn?" (What is it to be human? 1952). Important events in life 1911 – Moves to Mynachlog-ddu, Pembrokeshire, when his father becomes head of the primary school. 1915 – Moves to Llandissilio,