U.S. officials said Chinese law-enforcement agents covertly in this country are part of Beijing’s global campaign to hunt down and repatriate Chinese fugitives living abroad.

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WASHINGTON — The Obama administration has delivered a warning to Beijing about the presence of Chinese government agents operating secretly in the United States to pressure prominent expatriates — some wanted in China on charges of corruption — to return home immediately, according to U.S. officials.

The U.S. officials said Chinese law-enforcement agents covertly in this country are part of Beijing’s global campaign to hunt down and repatriate Chinese fugitives living abroad and, in some cases, recover allegedly ill-gotten gains. The Chinese government has officially named the effort Operation Fox Hunt.

The U.S. warning, which was delivered to Chinese officials in recent weeks and demanded a halt to the activities, reflects escalating anger in Washington about intimidation tactics used by the agents. And it comes at a time of growing tension between Washington and Beijing on a number of issues, including the computer theft of millions of government personnel files that U.S. officials suspect China directed, China’s crackdown on civil liberties and the devaluation of its currency.

Those tensions are expected to complicate the state visit to Washington next month by Xi Jinping, the Chinese president.

The work of the agents is a departure from the routine practice of secret government-intelligence gathering that the United States and China have carried out on each other’s soil for decades. The CIA has a cadre of spies in China, just as China has long deployed its own intelligence operatives into the United States to steal U.S. political, economic, military and industrial secrets.

In this case, U.S. officials said, the Chinese agents are undercover operatives with the Public Security Ministry, China’s law-enforcement branch charged with carrying out Operation Fox Hunt.

The campaign, a central element of Xi’s wider battle against corruption, has proved popular with the Chinese public. Since 2014, according to the ministry, more than 930 suspects have been repatriated, including more than 70 who have returned this year voluntarily, the ministry’s website reported in June. According to Chinese media accounts, teams of agents have been dispatched around the globe.

U.S. officials said they had solid evidence that the Chinese agents — who are not in the United States on acknowledged government business, and most likely are entering on tourist or trade visas — use various strong-arm tactics to get fugitives to return. The harassment, which has included threats against family members in China, has intensified in recent months, officials said.

The United States has its own history of sending operatives undercover to other nations — sometimes under orders to kidnap or kill. In the years after the Sept. 11 terrorist attacks, the CIA dispatched teams abroad to snatch al-Qaida suspects and spirit them either to secret CIA prisons or hand them over to other governments for interrogation.

Both China’s Public Security Ministry and the Foreign Affairs Ministry did not respond to faxes requesting comment. But Chinese officials have often boasted about their global efforts to hunt economic fugitives, and the state media has featured reports detailing the aims and successes of Operation Fox Hunt.

According to the Chinese media, Beijing has sent scores of security agents abroad to “persuade” their targets to return home.

Just how they accomplish their aims is unclear, and questions have been raised about why a number of suspects, presumably sitting on significant wealth abroad, have willingly returned to China.

Liu Dong, a director of Operation Fox Hunt, has said Chinese agents must comply with local laws abroad and that they depend on cooperation with the police in other countries, according to a state media report last year.

But in a telling admission, he added, “Our principle is thus: Whether or not there is an agreement in place, as long as there is information that there is a criminal suspect, we will chase them over there, we will take our work to them, anywhere.”

It is unclear whether the FBI or the Department of Homeland Security has advocated within the Obama administration to have the Chinese agents expelled from the country, but the White House decision to have the State Department issue a warning to the Chinese government could be one initial step.

The FBI and the Department of Homeland Security are in charge of tracking the activities of foreign agents inside the United States, and U.S. officials said both agencies had amassed evidence about the Chinese law-enforcement agents by speaking to Chinese expatriates and by monitoring the agents themselves.

One U.S. official acknowledged that Chinese agents had been trying to track down Ling Wancheng, a wealthy and politically connected businessman who fled to the United States last year and had been living in a lavish home he owns outside Sacramento, Calif.

Should he seek political asylum, he could become one of the most damaging defectors in the history of the People’s Republic.

Chinese state media published Interpol alerts in April for 100 people Beijing described as its most-wanted fugitives worldwide. But experts who have studied the names raised doubts whether the listed men and women are truly the government’s top priority.

Among the alleged fugitives, they said, are a former deputy mayor, employees of state-owned enterprises and a history professor, but few if any at highest echelons of power.

U.S. officials did not disclose the identities or numbers of those being sought by the Chinese in the United States. They are believed to be prominent expatriates, some sought for economic corruption and some for what the Chinese consider political crimes.

U.S. officials declined to provide specific evidence of the activities of the agents, and discussed details of the operation only on the condition of anonymity because of the tense diplomacy surrounding the issue.

That reluctance reflects divisions with the Obama administration over how aggressive to publicly confront China on a number of security issues.

For instance, the White House has gone out of its way to avoid making any public accusations that the Chinese government ordered the computer attack on the Office of Personnel Management, which led to the theft of millions of classified personnel files of current and former government workers and contractors.

China and the United States do not have an extradition treaty, and State Department officials would not say whether the warning carried any threats of penalties.

Mark Toner, a State Department spokesman, declined to comment about the diplomatic warning but he said that “generally speaking, foreign law-enforcement agents are not permitted to operate within the United States without prior notification to the attorney general.”

It is a criminal offense, he said, “for an individual, other than a diplomatic or consular officer or attaché, to act in the United States as an agent of a foreign power without prior notification to the attorney general.”