In 1935, Langston Hughes wrote Let America be America Again.The first 50 lines of the poem were published the next year in Esquire, ending with the line "Who said the free?". In 1938, the International Workers Order (IWO) published 10,000 copies of the entire poem in a collection of Hughes' poetry titled A New Song. It was not known to be printed in full again until 1994.
"Langston Hughes." https://www.poetryfoundation.org/poets/langston-hughes.