Anselm Kiefer is a painter and sculptor from Germany that was born in March 8, 1945. He is famous for using different types of materials within his paintings. According to my research on Kiefer, I can say that based on the information provided within the question the " To the Unknown Painter" can be interpreted as a metaphor for the artist.
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He was the leader of the Military and he was very determined to exterminate leftism in Chile and to reassert free market policies in the countries economy