The inmates’ willingness to come forward and be named speaks to their growing frustration with the pace of the investigation into their allegations. Amid worsening violence at the prison, some inmates said they had been subjected to further harassment after speaking out.

In the frantic days after the prison break, inmates said in letters and interviews with The Times that guards handcuffed them, took them for questioning into areas of the prison with no cameras, punched them and slammed them against the wall. One inmate described having a plastic bag pulled over his head and being threatened with “waterboarding.”

Victor Aponte, 60, who is serving a life sentence for kidnapping and rape, said it was the officer known as Captain America who tied a plastic bag around his neck like a noose during an interrogation and pulled it so tightly that Mr. Aponte passed out.

Later, Mr. Aponte said, he had asked around at the prison and had learned that the guard was Officer Stickney. Three other prisoners who were at Clinton at the time of the escape, Rashad Scott, Eddie Matos and Luis Zenon, also told The Times that Officer Stickney was Captain America.

Mr. Zenon, along with another inmate, Paul Davila, also named a second prison employee, Kevin Norcross, as being present during some beatings. Mr. Davila said that Mr. Norcross had identified himself as a member of the internal affairs unit with the State Department of Corrections and Community Supervision. While Mr. Norcross did not take part in the beatings, the inmates said, he witnessed them.