From The Economist:
Shrine controversy
Yotaro Kobayashi, the high-flying Chairman of Fuji Xerox, got some threatening packages after he criticised Japan’s prime minister, Junichiro Koizumi, for visiting a shrine honouring the Japanese war dead. A package sent to Mr Kobayashi contained a bullet, and Molotov cocktails (which failed to fully ignite) were found outside his home. Yasukuni, the controversial shrine that Mr Koizumi visited, was once a famous backdrop for war propaganda and emperor-worship. The dead commemorated there include convicted war criminals from the second world war.
The prime minister’s visits to Yasukuni have earned him criticism from a number of Japan’s neighbours, which are still bitter about the country’s long history of waging war on them. China in particular has said the visits show a lack of remorse from Japan, and has called for them to stop. Mr Kobayashi has been a target of right-wing groups since late last year, after he said the visits were fraying relations between Japan and China, which have been fragile lately.
If I’m not mistaken, Kobayashi made them as head of the Keizai Doyukai, whose members, I imagine were starting to grow concerned about anti-Japanese sentiment in China affecting their business there.