LINCOLN, Neb. (AP) — The ACLU of Nebraska is suing state prison officials on behalf of an inmate who says he was repeatedly attacked by fellow inmates, including a member of a white supremacist gang.

The lawsuit alleges that prison officials knowingly allowed Joshua Franklin to be assaulted several times at the Nebraska State Penitentiary in Lincoln.

Franklin, a biracial man serving time for nonviolent crimes, says he was first attacked by the gang member in the Sarpy County Jail. He says he was assaulted three more times after being moved to the state prison. Those assaults led to an orbital fracture, a detached retina, a head injury, memory loss and vision problems.

The lawsuit names corrections director Michael Kenney, three wardens and an assistant warden as defendants. Prison officials have not yet responded.