The ADL has a list of members of the far-right fringe group the Oath Keepers. Surprisingly, it doesn't include the entire R caucus of the legislature.

It should, though.

From the ADL -

The Oath Keepers Data Leak: Unmasking Extremism in Public Life

In the wake of the January 6th attack on the U.S. Capitol, significant public and legal scrutiny was focused on the Oath Keepers, a large anti-government extremist group associated with the militia movement. Despite the group’s national profile, few specifics were known about its membership.

That changed in September 2021, when the non-profit journalist collective Distributed Denial of Secrets (DDoSecrets) published – among other data – more than 38,000 names on the Oath Keepers’ membership list. The membership data provides unique insight into the people who signed up and paid dues to the organization over the years and helps illuminate the extent to which the group’s anti-government ideology has permeated mainstream society.

[snip]

There are some notable exceptions. While COE did not find anyone currently holding office at the federal level, there were several individuals on the membership list who hold state positions, including:

• Arizona State Senator Wendy Rogers, a self-proclaimed member of the Oath Keepers, who has remained a supporter despite the group’s alleged participation in the January 6 attack. In March 2021 – just two months after the insurrection – Rogers met with the Cottonwood Oath Keepers and praised the group for their “dedication to our Constitution and to our country.” According to the database, she signed up for an annual membership.

[snip]

• Major Eben Bratcher, who works for the Yuma County Sheriff’s Office, wrote, “I am currently the Patrol Bureau Commander for the Yuma County Sheriff’s Office in Arizona. We have 85 sworn officers and Border Mexico on the South and California on the West. I’ve already introduced your web site to dozens of my Deputies.” Bratcher claims he left the organization several years ago because of the number of emails it sent.

[snip]

While the open-source resources used by COE to identify individuals typically provide accurate information, there are some limitations to this methodology, particularly in verifying names within the database that matched the names of law enforcement and military personnel.

First, multiple people in an area may have the same name. To the best of its abilities, COE worked to verify the individuals in question, and common names in high-density population areas were excluded from the final count. In addition, where applicable, COE has informed law enforcement agencies (with appropriate caveats) across the country that a person with a name matching one of their employees was found in the Oath Keepers database. Some agencies have been responsive, but others have not responded, or have responded without confirmation. Every elected official or 2022 candidate included in the final total has been confirmed based on public reporting, public statements made by the individual in question, or by comparing the information provided to the Oath Keepers with the official’s public filings, public records, or online posts containing phone numbers, email addresses, or physical addresses.

Second, it is possible that these numbers do not fully account for individuals who may have moved a significant distance, those who do not have an online presence, and those who do not self-identify their profession on their social media pages. As such, it is possible that the true number could be higher than what is documented in this report.

Third, this report does not include people who only joined local Oath Keepers chapters, or who are Oath Keepers but never officially signed up for the group. Rhodes allowed members currently serving in law enforcement and the military to participate in the organization without formally signing up, knowing that formal association with the organization could endanger their employment.

Finally, it is important to note once more that an individual’s inclusion in the Oath Keeper database is not proof that they were or are still an Oath Keeper, that they hold or held all or some of Oath Keeper ideology or viewpoints, or that they ever actively participated in Oath Keeper activities. When reviewing this information, you should bear in mind the possibility that the individual misunderstood the nature of the Oath Keepers. Before taking any action based on this information, an individualized assessment of the individual must take place.

Let me sum up the caveats in a briefer fashion:

1. Inclusion in the DB is NOT definitive evidence that someone is extremist.

2. Not being in the DB is NOT definitive evidence that someone is NOT an extremist.

The AZ tally from the ADL report -

While the ADL report doesn't contain all of the specific names of the elected officials who are members of the Oath Keepers look to be Rogers, State Sen. Kelly Townsend, State Rep. Mark Finchem, and State Rep. Quang Nguyen.  How did I come up with that list?  This article from The Copper Courier, dated June 13, 2022 -

These 4 Arizona Lawmakers Have Ties to the Oath Keepers, a Far-Right, Anti-Government Group

The Proud Boys and Oath Keepers—two far-right, anti-government extremist groups—were at the center of Thursday’s first public congressional committee hearing regarding the attack on the US Capitol on Jan. 6, 2021.

[snip]

Several Arizona lawmakers have expressed support or admiration for the Oath Keepers during or before their time in office. Stewart Rhodes, the group’s leader and founder, is set to face trial for seditious conspiracy in September.

Rep. Mark Finchem, R-Tucson/Casa Grande, assumed office in 2015. Less than one year earlier, he posted about an Oath Keepers meetup in Tucson. 

[snip]

Sen. Wendy Rogers, R-Flagstaff, known to cozy up to white nationalists who praise Vladimir Putin and Adolf Hitler like Nicholas Fuentes, is a self-proclaimed member of the Oath Keepers. She met with the Cottonwood chapter two months after the Jan. 6 insurrection. 

[snip]

Sen. Kelly Townsend, R-Mesa, had “Oathkeeper” in her Twitter bio for months after the Jan. 6 insurrection. 

[snip]

Rep. Quang Nguyen, R-Prescott Valley, flatly said on Twitter, “I’m an Oath Keeper. Do not ever forget it. Now what?”

More on Finchem from Time Magazine, dated August 3, 2022 -

An Oath Keeper Could End Up in Charge of Arizona's Elections

Two Donald Trump loyalists who spun baseless conspiracy theories about the last presidential election moved one step closer Tuesday night to overseeing the next one in a key battleground state.

Mark Finchem, who has identified himself as a member of the Oath Keepers, marched to the U.S. Capitol on Jan. 6, pushed for a fruitless partisan review of the presidential ballots in Arizona’s Maricopa County, and has vowed to radically reshape voting rights in the state, won Arizona’s Republican primary for Secretary of State, a position which serves as the state’s chief election officer.