The GDR Through the Eyes of the Stasi - Data Mining on the Secret Reports of the State Security Service of the former German Democratic Republic Topics: Information Extraction; Mining Text and Semi-Structured Data; Pre-Processing and Post-Processing for Data Mining; Visual Data Mining and Data Visualization In Proceedings of the International Conference on Knowledge Discovery and Information Retrieval - Volume 0IC3K, 360-365, 2014 , Rome, Italy