There have been concerns in the past about Chinese companies doing business in the United States.

过去就有人对中国公司在美国做生意感到担忧。

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It is very hard to find a company now in the United States that doesn't have a wide presence or even doing some business on the Web.

现在已经很难找出哪个美国公司不在网上经常出现或在网上进行交易。

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The Iran Refined Petroleum Sanctions Act, which has overwhelming bipartisan support with more than would expand existing sanctions and effectively prohibit any non-U.S.company involved in selling,or enabling the sale or transport of, refined petroleum products to Iran from doing business in the United States.

VOA: standard.2009.09.25

The legislation crafted by House Foreign Affairs Committee Chairman Howard Berman, like a similar bill in the Senate, would prohibit non-U.S.companies selling, or enabling the sale or transport of refined petroleum products to Iran, from doing business in the United States.

VOA: standard.2009.10.28

The Financial Industry Regulatory Authority is the largest independent regulator for all securities firms doing business in the United States.

FORBES: All Phone Calls With Brokers In The UK Now Recorded; Coming Soon To Europe and America

Under the sanctions, 31 companies owned or controlled by the government of Sudan are barred from doing business in the United States and it is a crime for American companies and individuals to willfully do business with them.

NPR: U.S. Stiffens Sanctions on Sudan over Darfur

This grants immunity for actions a foreign government takes when it is acting as a government, but not for actions taken when it is acting as, for example, a commercial enterprise, which might occur when the government in question owns a company doing business in the United States.

CENTERFORSECURITYPOLICY: Sovereign Immunity or cover-up?