Crime reduction charity Nacro feels opportunities for probation officers to share their load must be explored.
They will include Abderrahmane Sissako, Souleymane Cisse, Kwah Ansah, Fanta Nacro and Julie Dash.
NACRO, an umbrella organisation for criminal-reform groups, by the Audit Commission and in internal Home Office reports.
Prison groups such as the Prison Reform Trust, Nacro and the Howard League for Penal Reform are against the proposals.
He launched his PCC campaign in June 2012 after leaving crime reduction charity Nacro, where he was head of resettlement information.
NACRO, a prison reform group, says that some switching from cannabis to heroin is going on, but the scale is unclear.
Paul Cavadino, chief executive of crime-reduction charity Nacro, said there was "no contradiction between meeting the needs of offenders and those of victims".
Nacro said the plans would damage efforts to take criminals away from a life of crime and exacerbate mental health problems in jails.
Richard Garside, spokesman for crime reduction charity Nacro, said Sir David was ideally qualified to speak about the problems with the prison system.
Mervyn Barrett in Lincolnshire, who resigned in June from Nacro, a charity that works at reducing criminal offending, says he worries about fund-raising all the time.
Mr Barrett, who withdrew his candidacy on Wednesday, worked for crime reduction charity Nacro for more than 30 years and was made an OBE in 1999 for services to crime reduction.
BBC: Mervyn Barrett contacts police over PCC campaign manager
And the crime reduction charity, NACRO, would like to see clearer guidance from the Home Office and Department for Education about the kind of information which employers are entitled to seek.
But Home Office minister Paul Boateng - who will set out plans for resettlement in a speech on Monday to the National Association for the Care and Resettlement of Offenders (Nacro) - denied the charge.
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