If convicted, they could face life in prison.
The Department of Justice says that the militia members allegedly stockpiled firearms, ammunition, and explosive materials. They planned to park four vehicles filled with explosives at the four corners of the apartment complex in order to set off a massive explosion.
The attack was planned to take place one day after the presidential election, on November 9, according to the DOJ.
The FBI has been monitoring the group for some time, and has surveillance tapes of the Crusaders members discussing the plot and their plans to start a "bloodbath" targeting Muslim immigrants in the United States.
They report that Stein allegedly said that "the only good Muslim is a dead Muslim" and that he would enjoy shooting Muslims in the head. Stein also added that even babies and toddlers would be "going bye-bye," according to the FBI.
"When we go on operations, there's no leaving anyone behind, even if it's a one-year-old, I'm serious."
The FBI is referring to the planned attack as domestic terrorism, according to Buzzfeed.
The Crusaders allegedly planned the terrorist attack for months, discussing various targets that would kill as many Muslims as possible. FBI Special Agent in Charge Eric K. Jackson said that they eventually settled on the Garden City apartment complex that houses approximately 120 Muslim immigrants and also contained a mosque that had been set up for worship.
The militia members wrote a manifesto that they planned to release after the bombing. In it, they wrote that they planned the terrorist attack in order to "wake people up," according to acting U.S. Attorney Tom Beall.
"These charges are based on eight months of investigation led by the FBI that is alleged to have taken investigators deep into a culture of hatred and violence," Beall said.
At some point during the investigation, the FBI was able to infiltrate the group with an undercover agent. The agent showed the group members automatic weapons that they could use during the terrorist attack, and was taken to the apartment building that the group planned to bomb.
The FBI reports that the bombing was planned to take part the day after the presidential election, in order to prevent influencing the election with their actions. Presumably, they wanted to give Donald Trump as much of a chance as possible to be elected president and did not want their terrorist actions to harm his candidacy.
While the FBI has not said which candidate the Crusaders militia group supports, many are assuming they are in support of Donald Trump.