A top Southern Poverty Law Center (SPLC) official has been accused of helping funnel more than $1. 2 million in donor funds to a confidential informant who infiltrated a neo-Nazi organization - a source prosecutors say was also the official's secret romantic partner.

The details were revealed in a superseding indictment filed June 2 by the Department of Justice (DOJ) against the SPLC, which has faced mounting scrutiny over allegations that it funded individuals tied to extremist groups it publicly opposed.

According to the document, the director of the SPLC's Intelligence Project was in a secret romantic relationship with a paid field source who infiltrated a neo-Nazi organization known as the National Alliance at the direction of SPLC.