In the 1980s, the DMA tried unsuccessfully to block the Internal Revenue Service from using a private magazine subscription list to find potential tax cheats.

FORBES: California Tax Collectors Eye Buying Names Of Web Shoppers

After an internal review of shipment records from a distributor, Blue Coat was able to provide information to help block future transfers.

FORBES: Surveillance Technology Firms Face Reputational Bust Amid Business Boom

America has agreed to negotiate with the EU as a block, but it will still try to limit Europe's access to America's internal market.

ECONOMIST: Opening skies | The

The text of the internal Goldman e-mails was disclosed Tuesday by attorneys for disgruntled NYSE seat holders who are suing to block the deal or at least get the NYSE board to consider all its options.

FORBES: Careful What You E-Mail!