Ahead of the Capitol attack, the Oath Keepers attended violent D.C rallies, called for civil war, and organized other far-right groups. They did so while explicitly claiming to work with armed cops, and advertising 1/6 on a politician's livestream. https://www.thedailybeast.com/far-right-oath-keepers-militia-went-all-in-before-the-capitol-riot
The Oath Keepers actively court cops, and threaten police violence against opponents. But their "patriot" posturing makes them less likely to earn condemnation from elected officials, some of whom have expressed support for the group. https://www.thedailybeast.com/far-right-oath-keepers-militia-went-all-in-before-the-capitol-riot
On 1/6, they appeared to be among the most organized groups in attendance. Ahead of the attack, multiple people filmed them moving through the crowd up the Capitol steps: https://twitter.com/jsrailton/status/1348115530654347266
Incredibly revealing leak of Oath Keeper communications from November. In it, members share tips on recruiting law enforcement, while talking about "executing lefties openly and violently" and "killing the news media live on air." https://unicornriot.ninja/2020/its-time-to-start-killing-the-news-media-live-on-air-oath-keepers-private-chats-show-increased-desire-for-post-election-violence/