WASHINGTON — Drugmaker Purdue Pharma, the company behind the powerful prescription painkiller OxyContin that experts say helped touch off an opioid epidemic, will plead guilty to federal criminal charges as part of a settlement of more than $8 billion, the Justice Department announced Wednesday.

The deal does not release any of the company’s executives or owners — members of the wealthy Sackler family — from criminal liability, and a criminal investigation is ongoing. Family members said they acted “ethically and lawfully,” but some state attorneys general said the agreement fails to hold the Sacklers accountable.

The company will plead guilty to three counts, including conspiracy to defraud the United States and violating federal anti-kickback laws, the officials said, and the agreement will be detailed in a bankruptcy court filing in federal court.

The Sacklers will lose all control over their company, a move already in the works, and Purdue will become a public benefit company, meaning it will be governed by a trust that has to balance the trust’s interests against those of the American public and public health, officials said.

The settlement is the highest-profile display yet of the federal government seeking to hold a major drugmaker responsible for an opioid addiction and overdose crisis linked to more than 470,000 deaths in the country since 2000.

It comes less than two weeks before a presidential election where the opioid epidemic has taken a political back seat to the coronavirus pandemic and other issues, and gives President Donald Trump’s administration an example of action on the addiction crisis, which he promised early on in his term.

Ed Bisch, who lost his 18-year-old son to an overdose nearly 20 years ago, said he wants to see people associated with Purdue prosecuted and was glad the Sackler family wasn’t granted immunity.

He blames the company and Sacklers for thousands for deaths. “If it was sold for severe pain only from the beginning, none of this would have happened,” said Bisch, who now lives in Westampton, New Jersey. “But they got greedy.”

Brooke Feldman, a 39-year-old Philadelphia resident who is in recovery from opioid use disorder and is a social worker, said she is glad to see Purdue admit wrongdoing. She said the company had acted for years as “a drug cartel.”

Democratic attorneys general criticized the agreement as a “mere mirage” of justice for victims.

“The federal government had the power here to put the Sacklers in jail, and they didn’t,” Connecticut Attorney General William Tong said in a statement. “Instead, they took fines and penalties that Purdue likely will never fully pay.”

But members of the Sackler family, once listed as one of the nation’s wealthiest by Forbes magazine, said they had acted “ethically and lawfully” and that company documents required under the settlement to be made public will show that.

“Purdue deeply regrets and accepts responsibility for the misconduct detailed by the Department of Justice in the agreed statement of facts,” Steve Miller, who became chairman of the company’s board in 2018, said in a statement. No members of the Sackler family remain on that board, though they still own the company.

Family members, in a statement, expressed “deep compassion for people who suffer from opioid addiction and abuse and hope the proposal will be implemented as swiftly as possible to help address their critical needs.”

As part of the resolution, Purdue is admitting that it impeded the Drug Enforcement Administration by falsely representing that it had maintained an effective program to avoid drug diversion and by reporting misleading information to the agency to boost the company’s manufacturing quotas, the officials said.

Purdue is also admitting to violating federal anti-kickback laws by paying doctors, through a speaking program, to induce them to write more prescriptions for the company’s opioids and for using electronic health records software to influence the prescription of pain medication, according to the officials.