Massachusetts members of the Ku Klux Klan reportedly are headed to Boston Common for the so-called Boston Free Speech Rally this Saturday, but a rally organizer said he doesn’t want the event “hijacked” by white supremacists.

“I know some of our members from the Springfield area are going,” said Thomas Robb, national director of the Knights of the Ku Klux Klan. “I’m assuming members in the Boston area are going.”

Robb did not provide details on who or how many members would attend the rally, but said they would be inconspicuous while supporting the rally.

“I don’t think they’re going to cause a disturbance,” Robb said, adding that Knights from different areas went to the Charlottesville rally. “Our members don’t stand out, they don’t walk around giving Nazi salutes, they might be your next door neighbor or Cub Scout leader.”

Rally organizer John Medlar, who has insisted his group is not racist, told the Herald, “Though we naturally respect their right to speak and assemble, we also will exercise our right to choose who we will associate with. We will not allow our platform to be hijacked by the KKK. If I see anyone bring out a swastika or throw a Hitler salute, I will immediately denounce them.”

The Free Speech Rally — which many fear will turn into a white nationalist protest — will take place from noon to 2 p.m. at the Parkman Bandstand tomorrow, with the prospect of massive counterprotests in the wake of the violence in Charlottesville, Va., that left a woman dead.

Medlar has said his group was not involved in Charlottesville — though some of the listed speakers were there — and that the Boston rally is meant to promote free speech, not white supremacy.

Mayor Martin J. Walsh said about the KKK: “Make no mistake: We do not welcome any hate groups to Boston and we reject their message. We have made it clear that we will not tolerate incitements to violence or any threatening behavior. I ask that everyone join me in making Boston a more inclusive, welcoming, love-filled city for all.”

Counterprotest organizers said they were not surprised by the Klan threat.

“We’ve been prepared for the worst like that since the beginning,” said Kelsey Taylor, one of the organizers for a rally that will take place in front of the State House. “It doesn’t change our plan, but it reminds us to be vigilant.”

“I’m not worried about it. It would be naive to think there aren’t Klansmen in Massachusetts,” said Angelina Camacho, one of the organizers of a Black Lives Matter rally that will march from the Reggie Lewis Track and Athletic Center at Roxbury Community College to Boston Common Saturday. “I’m looking forward to having a peaceful event without incident.”

Organizers on both sides of the rally have met with police to go over security plans, which include keeping Free Speech rally participants behind barriers and keeping them separated from counterprotesters. Police are urging people to not bring backpacks or strollers to the Common and are banning weapons, bicycles, signs attached to sticks and pets from the area.

Meanwhile, Christopher Cantwell of Keene, N.H., a self-described white nationalist who attended the rally in Charlottesville, said he was contacted by the FBI’s Joint Terrorism Task Force about helping defuse any violence in Boston. He told reporters he isn’t going because there is a warrant for his arrest in Virginia stemming from the rally there.

Herald wire services contributed to this report.