I would suggest trying to look on the 1900 or 1910 Census for Greer Co Granite Twp for your Smith men. They even list the prisoners. The guards on duty at time of the census was taken are listed. Most like the guards during the time period would have lived near by. One of my Thrower great uncles worked there during the 1930's. The rootsweb Greer Co OK website has a wealth of information plus has a search engine to search that site. They even have an index to the 1910 census for Greer Co OK. Hope this helps. Feel free to email me if you have other questions.