The letter asks Wal-Mart to give the nuns access to "electronic data, tape and video recordings, memorandum, correspondence and communications of any type or nature whatsoever" that make references to them. "What has been inadvertently revealed so far may just be the tip of the iceberg," the letter said, noting that the group had been involved in dialogue with Wal-Mart along with other members of the Interfaith Center on Corporate Responsibility since the 1990s. The January memo became public earlier this month, in interviews given to the Wall Street Journal by Bruce Gabbard, a former employee of Wal-Mart's security department…. Wal-Mart has written to shareholder groups saying that no action was taken in connection with the January memo, "given the nature of the matters proposed and our familiarity with the individual proponents".