A 40-year-old Nigerian national was sentenced to eight years in prison for running a years-long hacking, tax fraud and investment scheme, the Justice Department said Monday.

Chukwuemeka Victor Amachukwu enriched himself from 2019 to 2023 by hacking into U.S.-based tax preparation businesses, filing false tax returns with federal and state authorities using identities stolen from victim organizations and enticing victims to send him money for investments that did not exist, according to court records.

Amachukwu pleaded guilty to conspiracy to commit computer intrusions and wire fraud in April. He was arrested in France in July 2023 and extradited to the United States in August 2025.

“Chukwuemeka Amachukwu believed he was operating safely offshore when he targeted his victims, but he has now been held to account and now faces a serious sentence for his crimes,” Jamie McDonald, U.S. attorney for the Southern District of New York, said in a statement. 

“Amachukwu took part in sophisticated schemes to hack into U.S. businesses, steal and use stolen identity information of victims, and commit fraud,” McDonald added. “These crimes imposed significant harm on the victims and the public, and so it is only appropriate that the crimes also come with a significant sentence for the defendant.”

The financial penalties imposed on Amachukwu for his crimes accentuate the damage he inflicted at scale. A federal judge ordered him to pay nearly $3.65 million in restitution to his many victims and forfeit almost $10.85 million.

Prosecutors said Amachukwu and his alleged co-conspirators obtained more than $7 million in fraudulent investment schemes, about $2.5 million in fraudulent tax returns and $819,000 in fraudulent payouts from the Small Business Administration’s Economic Injury Disaster Loan program. 

Amachukwu, his alleged co-conspirator Kingsley Uchelue Utulu and other alleged Nigeria-based co-conspirators also stole the tax and personal data of at least 800 business customers after hacking into tax businesses based in New York, Texas and elsewhere, according to court records.

In one of those attacks, in May 2021, members of the conspiracy sent a spearfishing email to an employee of a New York-based tax preparation business, which infected the firm’s computer systems with malware.

The FBI, Justice Department’s Office of International Affairs and the U.S. Marshals Service assisted the investigation, which led to Amachukwu’s arrest and extradition from France.

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A joint international law enforcement and industry operation against scammers netted 28 arrests, rescued 117 trafficking victims and led to the takedown of more than 3.7 million accounts, the Justice Department announced Tuesday.

The crackdown, billed as “Joint Disruption Week,” focused on West Africa and also identified more than $11 million in freezable funds and led to the seizure of hundreds of electronic devices. The range of scams involved included law enforcement impersonation scams, digital arrest extortion schemes, pig butchering and other online fraud operations targeting victims around the world.

Participants heralded it as the largest joint scam operation to date, and the first focused on West Africa.

“For so long, the problem of international scams seemed impossible to tackle,” Kelly Milliron, acting chief of staff and counselor to the Assistant Attorney General leading the Criminal Division, told reporters. “But now, because of collaborations like Joint Disruption Week, we have a plan, a consolidated approach, bringing together people that can bring solutions and, most of all, safety for our citizens.”

It’s the latest effort in the Trump administration’s ongoing bid to make countering scam operations a theme of his term, and to make disrupting cyber adversaries and criminals a central focus of its cyber strategy. 

Participating agencies in the London-hosted operation beyond the Justice Department were the Scam Center Strike Force under the U.S. Attorney’s Office for the District of Columbia, the FBI, the Secret Service, the Treasury Department, Homeland Security Investigations, the Homeland Security Task Force, the United Kingdom’s National Crime Agency, the Nigerian Joint Case Team on Cybercrimes, the Nigeria Police Force’s National Cybercrime Center and the Ghanaian Cyber Security Authority, INTERPOL and agencies from Australia, Canada, India and New Zealand also were involved. 

Adobe, Binance, Coinbase, Cyjax, Elliptic, Chainalysis, Flashpoint, Google, Meta, Microsoft, OpenAI, Silent Push, Starlink and TRM Labs were companies that participated in the operation. Meta said it removed more than 3.7 million accounts, groups and pages from Facebook and Instagram based in West Africa, a majority of which targeted people in the United States and United Kingdom.

Some on Capitol Hill have raised concerns about whether U.S. operations to counter scams are coordinated enough.

The operation actually began in September, with a series of raids in Ghana before last week’s designated action. Jeanine Pirro, U.S. Attorney for the District of Columbia, said Disruption Week occurred not long after a new partnership with the United Kingdom.

“The aim is to bring cases in parallel and also to combat fraud together through joint targeting,” she said. “This was the perfect time to continue that partnership.”

It’s not clear how many of the potentially freezable funds will actually be frozen as a result of the operation.

“Identifying the assets is the easy part, and tracing them, going after and developing probable cause within our investigations so that we can legally seize them does require a little bit of work,” said Matthew Floyd, deputy assistant director of the FBI’s Criminal Investigative Division. “So at this point, that’s why it’s much easier in these efforts to identify assets initially, and then they’ll fold into our investigations as we move forward.”

Disruption Week was the culmination of agencies meeting to combine forces, something that will happen on a regular basis, Floyd said, but at an interval to be determined going forward. The operation led to the sharing of more than 30 leads on scam centers, participants said.

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Five alleged leaders of the South African wing of Black Axe, a global cybercrime group with operations spanning dozens of countries, were extradited to the United States Friday to face multiple charges, the Justice Department said.

Officials accuse the five people, all originally from Nigeria, of running romance scams and advance fee scams from at least 2011 until they were all arrested in South Africa in 2021. The defendants were due Monday for initial court appearances and arraignments in a federal court in Trenton, N.J.

“Black Axe is a notoriously violent transnational criminal organization that also happens to dabble in romance scams to make money,” Stefanie Roddy, special agent in charge of the FBI Newark field office, said in a statement. “The ability of FBI Newark and our partner agencies to reach into South Africa illustrates our resolve to hold accountable any and every type of fraudster who preys on innocent victims here in the United States.”

The accused include Perry Osagiede, founder and leader of the Cape Town Zone of Black Axe; Franklyn Edosa Osagiede, the zone’s “chief ihaza” Osariemen Eric Clement, “assistant eye of the zone,” Collins Owhofasa Otughwor, the zone’s “chief eye,” and Musa Mudashiru, one of the group’s “assistant butchers.”

Prosecutors said the five defendants and their co-conspirators used fake identities to pose as a love interest, relatives, business partners or friends to trick victims into sending them money.

Many of the scams involved claims that the alleged cybercriminals needed money for work travel or to hold them over financially following a series of unfortunate events. This included requests for loans, often involving issues with a construction site, delayed inheritance, or expensive health costs for claimed relatives, according to an unsealed indictment filed in the U.S. District Court of New Jersey in 2021. 

Prosecutors said the co-conspirators also used business entities and gained access to the financial accounts of some victims to conceal the funds illegally obtained from other victims. In some cases, the alleged Black Axe members threatened to distribute sensitive photos of victims when they hesitated to send money, officials added.

The extradition follows a heightened period of law enforcement activity targeting Black Axe in multiple countries. 

Authorities arrested 34 alleged cybercriminals in Spain, including some Black Axe leaders, for adversary-in-the-middle scams such as business email compromise, money laundering and vehicle trafficking in January. 

Officials seized millions in assets, arrested 58 individuals and identified 263 suspects, including members of Black Axe, in a multi-country sting operation in August. 

Black Axe is a highly structured, hierarchical group that generates billions of dollars in criminal proceeds annually from many small-scale operations spanning dozens of countries. 

All five of the extradited individuals are charged with conspiracy to commit wire fraud and money laundering. Perry Osagiede and Franklyn Osagiede are also charged with wire fraud and aggravated identity theft. Officials also charged Clement with wire fraud and Otughwor with aggravated identity theft. The combined charges carry up to 62 years in prison. 

“This case reflects the result of a years-long effort by the U.S. Secret Service and our law enforcement partners to identify, investigate, and bring to justice those who allegedly preyed on victims through sophisticated online fraud and money laundering schemes,” Craig Marech, special agent in charge of the U.S. Secret Service’s Newark field office, said in a statement. 

The Justice Department published additional information about the Cape Town Zone wing of Black Axe, including multiple aliases and business entities used by the group’s members, and encouraged potential victims to contact the FBI.

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