The Sociology Department closed in 1989 for various reasons. You can read more about the history of the department in these articles:
Sociology at Washington University in St. Louis: History and Reflections, 1906-1989 David J. Pittman and Deirdre Boden
The American Sociologist , Vol. 20, No. 4 (Winter, 1989) , pp. 305-321 Published by: Springer
Article Stable URL: http://www.jstor.org/stable/27698490
History of Anthropology at Washington University, St. Louis, 1905-2012 David L. Browman
http://openscholarship.wustl.edu/books/1
Washington University's Pig Roast: Ending Sociology and Jeopardizing Liberal Arts Barbara Sherman Heyl
The American Sociologist , Vol. 20, No. 4 (Winter, 1989) , pp. 341-345 Published by: Springer
Article Stable URL: http://www.jstor.org/stable/27698495
In 2015, Washington University re-established the Department of Sociology in Arts & Sciences. https://sociology.wustl.edu/
You can discover more about Washington University's history by browsing a guide to University Archives, http://libguides.wustl.edu/universityarchives
