Otto Bauer was an Austrian politician and a prominent figure in the early 20th century. Born on September 5, 1881, he was a leading member of the Austro-Marxist movement and played a significant role in the Social Democratic Party of Austria. Bauer was known for his theories on nationalism and socialism, advocating for the rights of various ethnic groups within the Austro-Hungarian Empire. In addition to his political work, Bauer was also a prolific writer and intellectual. He contributed to various publications and was involved in debates about the future of socialism in Europe. His ideas influenced many socialists and leftist movements, making him an important figure in the history of European socialism. Bauer passed away on July 4, 1938.