Lots of corruption in the higher levels of German companies lately. Siemens, and now Deutsche Post. Hundreds of others to be possibility implicated in this tax fraud round-up: http://www.iht.com/articles/2008/02/15/business/tax.php
Apparently, Dr Z. is not the only one. An article floating around say'd that "Hundreds" of people are involved in this round up of tax evaders. Z was just the highest profile type nabbed.