Two men pleaded guilty Tuesday to participating in a ring that forced teenage girls to work as prostitutes in a half dozen states - Florida, Massachusetts, Maine, New Jersey, New York and Pennsylvania.

Shaun Leoney, 28, of Boston, and Aaron Brooks, 25, of Quincy, were among six men who were indicted in 2007 for participating in a Boston-based prostitution ring that operated from 2001 to 2005.

Leoney and Brooks originally were charged with conspiracy and transportation for prostitution. Leoney also was charged with sex trafficking of children.

Both men pleaded guilty Tuesday to a single count of conspiracy. Brooks reached a plea deal with prosecutors, who will recommend a sentence of four years. Leoney faces a maximum of five years in prison.

Sentencing for both men was scheduled for Dec. 15.

As part of their guilty pleas, Leoney and Brooks admitted they drove a teenager to Orlando, Fla., during Memorial Day weekend in 2005 for prostitution activity sponsored by Hoodlum Entertainment, a company owned by two convicted sex traffickers.

Brooks faced a maximum of 15 years if he had gone to trial on the original charges, said his attorney, Raymond O'Hara.

"He just wants to put this behind him," O'Hara said.

Leoney's lawyer, James Dilday, said Leoney faced a maximum of 40 years if he had been convicted of the original charges.