FORMER NEW YORK CITY mayor and multibillionaire Democratic presidential candidate Mike Bloomberg used prison labor to make campaign calls. Through a third-party vendor, the Mike Bloomberg 2020 campaign contracted New Jersey-based call center company ProCom, which runs calls centers in New Jersey and Oklahoma. Two of the call centers in Oklahoma are operated out of state prisons. In at least one of the two prisons, incarcerated people were contracted to make calls on behalf of the Bloomberg campaign.

According to a source, who asked for anonymity for fear of retribution, people incarcerated at the Dr. Eddie Warrior Correctional Center, a minimum-security women’s prison with a capacity of more than 900, were making calls to California on behalf of Bloomberg. The people were required to end their calls by disclosing that the calls were paid for by the Bloomberg campaign. They did not disclose, however, that they were calling from behind bars.

“We didn’t know about this and we never would have allowed it if we had. We don’t believe in this practice and we’ve now ended our relationship with the subcontractor in question.”

The Bloomberg campaign confirmed the arrangement in an emailed statement to The Intercept. “We didn’t know about this and we never would have allowed it if we had,” said Bloomberg spokesperson Julie Wood. “We don’t believe in this practice and we’ve now ended our relationship with the subcontractor in question.”

The campaign said it did not know about the arrangement between ProCom and an undisclosed campaign vendor until The Intercept made its inquiry. The campaign then ended the relationship on Monday and said it has asked vendors to do a better job of vetting subcontractors in the future.

“The use of prison labor is the continued exploitation of people who are locked up, who really have virtually no other opportunities to have employment or make money other than the opportunities given to them by prison officials,” said Alex Friedmann, managing editor of Prison Legal News and an advocate for incarcerated people’s rights.

John Scallan, a ProCom co-founder, said his company pays the Oklahoma minimum wage of $7.25 an hour to the Oklahoma Department of Corrections, which then pays the incarcerated people working in the call centers. The Department of Corrections website lists the maximum monthly wage for the incarcerated at $20 dollars a month, but another policy document says there is a maximum pay of $27.09 per month.