A Florida man who went into the U.S. Capitol on Jan. 6 as part of a group of Oath Keepers pleaded guilty on Wednesday in a large criminal conspiracy involving more than a dozen other defendants charged in connection with the Capitol attack. 

Graydon Young is the first Oath Keeper charged in the large conspiracy to enter a public guilty plea. Judge Amit P. Mehta accepted Young’s guilty plea at a hearing in D.C. federal court, within eyesight of the U.S. Capitol.

Young pleaded guilty to two charges: one criminal conspiracy charge and a second count of obstruction of an official proceeding. As part of the plea agreement, Young will fully cooperate with the government and testify before a grand jury if called upon.