Many are said to have come from Russia after America blocked the sale of sophisticated weapons, such as attack helicopters, because of human-rights abuses by Nigerian soldiers.New tactics are helping.
Although firms have probably become more permissive since, a survey by Robert Half Technology, a recruitment agency, found in 2009 that more than half of chief information officers in America blocked the use of sites such as Facebook at work.Yet this approach comes at a price, and not only because it makes a firm less attractive to Facebook-using, iPhone-toting youngsters.
When I hear Mr Trump or Mrs Clinton or Mr Sanders talk about how they are going to stop free trade and in some way block America from being part of the world trading system, it makes my blood run cold.
Russia may table a UN Security Council resolution to the same effect, although America, Britain and France will block it.
America and others block loans from the World Bank and the Asian Development Bank, a measure supported by the NLD.
In 2008 America's Congress blocked Huawei's plans to buy 3com, another computer-equipment firm, citing similar security worries.
But even if Hillary Clinton wins, Republicans may yet be able to block America from entering into the agreement.
Yet each assumes inordinate significance, because of the fear that China will be aggressive and the suspicion in China that America means to block its rise.
Donald Trump has become the race candidate, the white nationalist candidate who calls for walls instead of bridges, that appeals to those who want to block America's new multi-racial demographic future.
It is clear to us that there is a well-funded and powerful campaign to discredit the path of negotiations and to block America's participation in this international agreement.
