Bribery is a serious problem in China, but BusinessWeek reports that U.S. prosecutors, along with their Chinese counterparts, are stepping up enforcement.

U.S. prosecutors, empowered by the Foreign Corrupt Practices Act of 1977 (FCPA) to investigate allegations of bribery anywhere in the world, have been stepping up their activities in China, where a tradition of gift-giving in business often degenerates into serious graft. The FCPA bans U.S. companies from bribing foreign officials. It also applies to foreign companies like Siemens that list their securities on U.S. exchanges. Companies that violate the FCPA face millions in fines, and executives can go to prison. U.S. authorities have upped the number of bribery cases they pursued to a resolution around the world, from 11 in 2005 to 34 last year, according to Trace International, a nonprofit anti-bribery group based in Annapolis, Md. In a report released June 17, Trace pointed out that China, with 25 cases completed since enactment of the FCPA, fell behind only Iraq and Nigeria for the most international corruption prosecutions. Citing a World Bank estimate that more than $1 trillion in bribes are paid each year, U.S. Attorney General Eric H. Holder Jr. on May 31 called “combating corruption one of the highest priorities of the Department of Justice.”

Chinese prosecutors, meanwhile, are getting more aggressive under their own antibribery laws, says Patrick M. Norton, a partner with Steptoe & Johnson who focuses on international mediation.

Slowly but surely, the game is changing.