Ezra Pound was a modernist American poet who was influential in promoting new styles and forms of poetry in the early 20th century. He helped many major contemporary writers through generous support and criticism, including W.B. Yeats, T.S. Eliot, and Robert Frost. Pound coined the term "Imagism" and stressed clarity, precision and economy of language in poetry. Later in life, he spent nearly 50 years working on his epic poem, The Cantos. However, he also became involved in fascist politics during his exile in Italy and was arrested for treason after World War II for making pro-fascist radio broadcasts.