Heidi Beirich, an expert on far-right groups, has been charged over the alleged misuse of donor funds to pay informants.

A leading expert on far-right groups in the United States has been charged by the administration of President Donald Trump for her alleged role in the use of donor money to secretly pay confidential informants.

On Wednesday, the Justice Department served an arrest warrant to Heidi Beirich, 59, the former director of intelligence for the Southern Poverty Law Center (SPLC), a civil rights nonprofit based in Montgomery, Alabama.

It also issued a superseding indictment to include Beirich in its ongoing prosecution of the SPLC, which the Trump administration has accused of deceiving donors. An initial indictment was made against the group in April.

Beirich has been charged with wire fraud, conspiracy to submit false statements to a bank, and conspiracy to commit money laundering, FBI Director Kash Patel said.

“Heidi Beirich was at the center of our ongoing investigation into SPLC and their previously alleged criminal activity,” Patel wrote on the social media platform X.

“SPLC knowingly misled donors, who believed their money was being used to dismantle violent extremist organizations – when in fact, part of those donations were instead being used to pay senior leadership within those extremist groups.”

But critics have questioned the Trump administration’s motivations for pursuing criminal charges against the SPLC, which has historically worked with the FBI to track alleged far-right hate groups.

The SPLC has been a frequent target of conservative critics who claim the nonprofit is politically biased.

The group’s stated mission is to fight white supremacy and create a multiracial democracy, and it has issued publications critical of conservative groups like Turning Point USA, which it characterised as a “case study of the hard right”.

Beirich’s lawyer, Michael Proctor, said his client is innocent of the charges and described the case as politically motivated. He accused prosecutors of trying to punish his client for her “decades-long record of success dismantling hate groups”.

“A free and fair society does not use the justice system to silence its political opponent,” he said.

The superseding indictment accuses the SPLC and Beirich of directing more than $4m in donations to “individuals associated with various violent extremist groups” between 2007 and 2023.

The practice, according to the Justice Department, amounted to fraud.

Beirich was part of the SPLC’s effort “to open bank accounts in completely fictitious companies’ names and make payments to individuals for reasons that were not accurate”, according to Attorney General Todd Blanche.

The SPLC has acknowledged that it used confidential informants in the past to gather intelligence on hate groups such as the Ku Klux Klan and the National Socialist Party of America, but the group said it no longer does so.

The SPLC has also said that it shared information obtained from informants with local and federal law enforcement.

“Violent extremists have not stopped or intimidated Dr Beirich from her vital work during her time at the SPLC,” Proctor said. “Dr Beirich won’t be silenced or intimidated by the government’s false and politicized allegations now.”