PORTLAND, Ore.  — A young couple accused of killing four people in a multistate crime spree last fall have been indicted of federal racketeering charges alleging the rampage was part of a campaign to “purify” and “preserve” the white race, the U.S. Attorney for Oregon, said Friday.

A federal grand jury handed up the indictment Thursday against David “Joey” Pedersen, 32, and Holly Ann Grigsby, 25, prosecutor Amanda Marshall said in a news release. Grigsby will be arraigned Monday in Seattle. Pedersen’s arraignment in Portland hasn’t been scheduled.

They are charged in the killing, kidnapping and robbery of four people last fall: Pedersen’s father, David “Red” Pedersen, and stepmother, Leslie “DeeDee” Pedersen, on Sept. 26 in Everett, Wash.; Cody Myers, a 19-year-old from Oregon on Oct. 1; and Reginald Clark, 53, of Eureka, Calif., on Oct. 3.

Clark was black and Grigsby allegedly told investigators that Myers, a Christian, was killed because his name sounded Jewish.

The 24-page indictment charges that Pedersen and Grigsby were members of a criminal enterprise whose aim was to promote a white supremacist movement.