The indictment describes how several of the co-defendants, including Kenneth Chesebro, Michael Roman and James Shafer, worked together from Dec. 11, 2020. through Dec. 25, 2020, in several states including Georgia and Arizona, to commit acts “in furtherance of the conspiracy.”

The alleged acts include Shafer reserving a room at the Georgia State Capitol in Fulton County, Georgia to gather "Trump presidential elector nominees," and Chesebro sending emails to Roman regarding Trump presidential elector nominees in other states.

The indictment also describes how the co-conspirators allegedly communicated with the Trump campaign about the Trump electors.

According to the indictment, Rowan instructed an individual associated with the Trump campaign to "distribute information related to the December 14, 2020 meetings of Trump presidential elector nominees in Georgia, Arizona, Michigan, Nevada, New Mexico, Pennsylvania and Wisconsin to other individuals associated with the campaign and co-conspirator 4."

On Dec. 13, 2020, Chesebro sent an email to Giuliani outlining the “multiple strategies for disrupting and delaying the joint session of congress on January 6, 2021,” the indictment says.

The alleged enterprise "falsely accused" Fulton County election worker Ruby Freeman of committing election crimes, the indictment says.

Members of the alleged enterprise traveled out of state "to harass Freeman, intimidate her, and solicit her to falsely confess to election crimes that she did not commit," it says.

The alleged enterprise, including "several" of the defendants, created "false Electoral College documents" and recruited individuals to cast "false Electoral College votes" at the Georgia State Capitol on Dec. 14, 2020, and then transmitted those votes to the president of the U.S. Senate, the U.S. archivist, the Georgia secretary of state, and the chief federal judge in Atlanta, the indictment says.

"The false documents were intended to disrupt and delay the joint session of Congress on January 6, 2021, in order to unlawfully change the outcome of the November 3, 2020, presidential election in favor of Donald Trump,” says the indictment.

In addition to the 19 defendants listed in the indictment, as many as 30 unindicted co-conspirators were involved in the criminal scheme, according to prosecutors.

"The Defendants, as well as others not named as defendants, unlawfully conspired and endeavored to conduct and participate in a criminal enterprise in Fulton County, Georgia, and elsewhere," the indictment says.

The indictment says "several" of the defendants made false statements to Georgia officials, including the secretary of state and Speaker of the House of Representatives, and "corruptly solicited [them] … to violate their oaths to the Georgia Constitution and to the United States Constitution by unlawfully changing the outcomes of the November 3, 2020, presidential election in favor of Donald Trump."

Multiple witnesses have been spotted and testified before the Fulton County grand jury today, including two former state lawmakers.

Former Democratic state Sen. Jen Jordan testified today, she told local outlets as she left the courthouse, saying she testified for about 40 minutes.

Former Democratic state Rep. Bee Nguyen also testified, according to a statement.

"Today, I testified in front of the Fulton County Grand Jury," the statement said. "When I took my oath of office in 2017, I swore my allegiance to our Constitution and promised to protect and defend our State and our country. On December 2020, when Rudy Giuliani and the former President’s legal team appeared before the Georgia House of Representatives, I upheld my oath and told the truth in the face of false testimony about our elections."

"Today, I reaffirmed my allegiance to our State and country -- by exercising my patriotic duty as a U.S. citizen and telling the truth under oath," she continued. "As a former lawmaker, I respect the separation of power and the crucial role that our judicial system plays in protecting our democracy by holding everyone accountable, even powerful individuals."

Georgia election official Gabriel Sterling, who spoke exclusively with ABC News’ Jon Karl over the weekend, was also spotted in the courthouse by The Atlanta Journal-Constitution.

-ABC News' Olivia Rubin, Will Steakin, Laura Romero and Richard Elliott