The national Black Lives Matter group is accusing a top left-wing dark money group in court of mismanaging and withholding $33 million of its cash, according to a complaint.

The lawsuit, filed on Monday in California Superior Court in Los Angeles County by the Black Lives Matter Global Network Foundation, claimed that the Tides Foundation “refused to honor its promises and continues to commandeer BLMGNF’s donations.” The Tides Center, an affiliate of the San Francisco-based Tides Foundation that incubates new progressive groups, previously acted as a fiscal sponsor of BLMGNF and is bankrolled by influential Democratic megadonors, including George Soros and Bill Gates, tax forms show.