Last month I wrote about several popular genealogy sites being pressured into removing or altering access to the Social Security Death Index (SSDI) through the actions of four Senators in support of a bill by Representative Sam Johnson (R - Texas) to remove all public access to the Death Master File, often referred to as the SSDI. This is an extremely valuable tool for anyone researching 20th century U.S. ancestors, and loss of access would be a huge blow for genealogists.