Two Portland residents whose homes were the target of FBI raids last week have been subpoenaed to appear on Thursday before a federal grand jury in Seattle.

Attorneys from the National Lawyers Guild in Seattle suspect the subpoenas are related to an ongoing FBI investigation into May Day vandalism in Seattle, including damage to a federal courthouse there.

The two Portland residents, Dennison Williams, 33, and Leah Plante, 24, will appear at 2 p.m. before the grand jury in Seattle, but pledged they won't cooperate.

"If we appear before the grand jury, we will not answer any questions other than our names. If we are asked additional questions, we will invoke our First, Fourth and Fifth Amendment rights," said Dennison Williams, 33, in a written statement Wednesday. He issued it on behalf of Plante as well.

The subpoenas coincided with the

including Williams' and Plante's separate residences in Northeast Portland.

Similar federal raids were conducted in Olympia and Seattle last month. Five people in total have been subpoenaed to appear before the grand jury on Thursday - including two from Olympia and one from the Seattle area, according to the Seattle chapter of the National Lawyers Guild.

Neil Kelley, of the Seattle National Lawyers Guild, said he's concerned the raids and subpoenas are being used as a pretext to harass political activists.

Representatives from Portland's and Seattle's FBI offices and the U.S. Attorney's office in Seattle have declined comment.

But federal court records indicate authorities are looking into an "organized 'black block' of anarchists" who marched all in black, carried red flags on sticks and sticks with screws or bolts on the ends and broke out windows of the William Kenzo Nakamura U.S. Courthouse in Seattle on May Day.

At the federal court building, glass doors near an entrance were shattered with rocks. Protesters then threw or shot a smoke bomb toward the lobby, but the device hit the one door that didn't break and started a small blaze that quickly burned itself out.

The search warrant left behind at Williams' residence at 7129 N.E. Eighth Ave. last Wednesday said federal agents were looking to seize evidence of, or property used in the federal "destruction of government property," "conspiracy to destroy government property," "interstate travel with intent to riot ," or "conspiracy to travel interstate with intent to riot.'

Williams said he was home when the federal agents broke down his door, with guns drawn. He said he was handcuffed, with no pants on, and placed in a chair in the home as federal agents hauled out clothing and computer equipment from the residence.

, federal authorities were looking for anti-government or anarchist literature or material; black clothing, backpacks, face coverings and shoes; green, red, black, grey or blue/purple paint; sticks and flags carried during the commission of the offenses and material for making flags; computers, cell phones and electronic storage media, and flares or similar incendiaries.

They took Williams' laptop computer, cell phone, and two thumb drives, and multiple pieces of black clothing, including one pair of black combat jeans, one black long-sleeve t-shirt, two black bandanas and a T-shirt that read on the front "Multi Death Corporations,''

"I think they're trying to intimidate people to speak about their relationships with individuals to suppress political dissent," Williams said, in an interview Wednesday. "I going to be resisting the grand jury by not cooperating and not talking."

Asked if he participated in

, Williams said, "I'm not going to respond."

Williams, who said he's an independent computer programmer, said he believes the federal authorities are investigating "anarchists in the Pacific Northwest.''

"I work on a lot of different projects that have anarchist philosophies guiding them,'' he said.

He said he provides technical support for radical groups and is involved in "community transformative justice projects.''

Williams is on probation for resisting arrest and fourth-degree assault convictions stemming from an

. He said he participated in a march against Portland police brutality and was stopped when crossing an intersection.

"I've been the victim of violent actions against my person by the FBI and police," Williams said.

Court records show Plante's address is 4820 N.E. 31st Ave., another Portland location raided by the FBI last week. Two years ago,

, Plante wrote, "I'm vegan, straight edge and very active in the punk community.'' She wrote that she works at a record store and volunteers at a "collectively run bookstore.''

The third address raided in Portland was 6846 N. Greenwich. No arrests were made.

One man has been indicted and sentenced on a federal charge in connection with the federal court vandalism in Seattle.

In June, Cody Ingram, a homeless man who had traveled across the country with his dog to participate in Seattle's May Day demonstration, pleaded guilty to destruction of government property, a misdemeanor, in U.S. District Court in Seattle. He was sentenced to time served and $500 in restitution.

Seattle police spokeswoman, Det. Renee Witt, said Seattle police investigators are working closely with the FBI in a continuing investigation of the May Day vandalism to the courthouse.

"We continue to look for the people responsible," Witt said.

Neil Kelly, of the Seattle National Lawyers Guild, said he's concerned the raids and subpoenas are being used as a pretext to harass political activists.

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