Lev Leviev and his diamonds are well known to be directly financing the expansion of Israeli colonies into the Palestinian territories (which is a war crime according to the Geneva conventions). The result is the impoverishment and continued subjugation of the Palestinian people.

Background info on Leviev:

 http://stopthewall.org/worldwideactivism/1746.shtml

 http://electronicintifada.net/v2/article9980.shtml

 http://www.bigcampaign.org/index.php?page=why-leviev

 http://www.alternativenews.org/news/english/unicef-rejects-support-from-israeli-billionaire-known-for-constructing-settlements-on-palestinian-lands-20080622.html