In December, two cybercriminals broke into a gyms in New York City, stealing a $5,000 donation card from the owner.
They then used the stolen card to make purchases at a bar and a hotel.
The attackers also made purchases at an Apple store in New Jersey.
The hackers had already infiltrated the hackerspace, and used a code that could be used to gain access to all of its servers, including its database, according to a court document.
Now, two hackers are threatening to hack the hackerspaces in New Orleans, Atlanta, Washington, and the Chicago area.
Hackerspace operators, including those in New Mexico and Idaho, have warned that they will be attacked if they don’t act.
One of the two hackers, a 26-year-old named Andrew Zemel, is currently living in New Zealand and was arrested in April for allegedly stealing $8,000 from a hotel in New South Wales, Australia.
Zemels LinkedIn profile describes him as a “hacker and activist.”
In December 2016, he was sentenced to six years in prison for hacking into and stealing money from banks in China, and is currently in the custody of the United States Justice Department.
The United States attorney for the Northern District of Illinois, Amy Spitalnick, told Fortune that Zemell is an “individual who is known to have engaged in criminal conduct.”
In May, Zemelman was arrested on charges of cyberstalking, fraud, and money laundering, according the New York Times.
He was released on $150,000 bail.
The other hacker, 27-year old Daniel R. Shaviro, is from New Jersey, but was arrested and charged in November.
The indictment against him included the theft of $5 million from two companies: Bank of America and JPMorgan Chase.
Shapiro has been charged with conspiracy to commit computer hacking, computer fraud, wire fraud, bank fraud, identity theft, and identity theft over $10,000.
He is currently awaiting trial in New Hampshire.
In the indictment, prosecutors said he used the $5.5 million stolen from the banks to buy $1,400 worth of clothes and other goods from online retailers, including Target, Victoria’s Secret, and Walmart.
Zebulon Breslow, a former employee of the hackers and cybercrime prevention program at New Mexico’s Department of Public Safety, told the Times that Zimels LinkedIn page showed that he has been “banned” from the state’s hackerspace for “criminal behavior.”
Breslo told Fortune in an email that the hackers have threatened to “take advantage of any situation” they can find.
“We have an obligation to the people who work at the hackers as part of our job to not let the cybercrimics use the cyberspace to commit crimes,” Breslovesaid.
“The hackerspace does not allow criminal activity or any criminal activity to occur.
It has been known to be the safest place in the state.”
Hackerspaces have already experienced attacks.
In October, a group of hackers and cybersecurity experts at Georgia Tech and the University of New Mexico, both located in Atlanta, were caught hacking into the systems of the University at Buffalo and the New Mexico State University.
In December 2015, hackers at the University Of Washington and the California Institute Of Technology were also caught.
Hackering at schools and universities is just one way that hackers use cyberweapons.
The U.S. military is now using remote control equipment, like the BlackHat security breach last year, to hack into systems at government agencies.
Hacktivists and others also have used software to steal credit card numbers, passwords, and other personal information from businesses.