Because of its basis on Ibarro 's letter , Olsen 's poem also fits within the genre of workers correspondence .
Both Olsen 's poem and Ibarro 's letter have been called proletarian literature , a popular school of writing in the United States in the 1930s .
Because of poem 's basis on Ibarro letter letter , Olsen 's poem also fits within the genre of workers correspondence .
Both Olsen 's poem and Ibarro 's letter have been called proletarian literature , a popular school of writing in the United States in the 1930s .