11/12/2015 06:30 EST | Updated 11/12/2016 00:12 EST

Prison union wants Stéphane 'Godasse' Gagné to serve his full sentence

A union representing Quebec prison guards is irked after being snubbed at parole hearings for Stéphane "Godasse'' Gagné, the former Hells Angels sentenced to 25 years without parole for killing prison guard Diane Lavigne in 1997.

Gagné was also convicted of the attempted murder of prison guard Robert Corriveau in the same year.

Gagné, who was slated to be released in 2023, filed a motion before a judge this week to be released before the end of his sentence. The request was supported by the Crown.

The union president of Peace Officers in Correctional Services of Quebec (SASPQC) Mathieu Lavoie, said his group was never informed about the request, which he learned about through the news media.

"Our colleagues were killed just because they were peace officers in correctional services. It was an act of intimidation and any of us could have been the target Godasse," Lavoie said.

After being convicted for the murder of Diane Lavigne, Stéphane Gagné became informer in exchange in a deal which saw charges dropped in his role in the murder of a third prison guard, Pierre Rondeau.

With Gagné's help, prosecutors were able to incarcerate some of his brothers in arms, including the head of the Hells Angels, Maurice "Mom" Boucher.

Gagné's parole request was backed by police officers, judges and Crown prosecutors.

Several letters testified to his remorse and were read to a jury which will decide the issue.

The guards' union is the only group that has spoken up against his release.

"The message they send is that it's okay to attack a peace officer, you can make amends and become an informer and you'll be rewarded," said Lavoie, who would like to see Gagné serve out his entire sentence.

"He might have been an important informer, thank you, but he still attacked and tried to destabilize Quebec's justice system."