Bloem said he had been approached by correctional services employees because of his link with the department in the past. Bloem was chairperson of the portfolio committee between 2004 and 2009, when he was ANC MP.
"Workers know me from the time I was chair of the portfolio committee," Bloem said.
He said workers told him there was a a shortage of uniforms, their weekend overtime pay had been reduced or stopped, pay progression and promotions were stopped for ordinary workers but enjoyed by a few politically connected senior managers.
At the time of publication, sister publication TimesLIVE was yet to receive a response from the department. Its response will be published when it is received.
Bloem said promotion within the department was a serious problem. There were cases of workers who were serving for 20 years in one rank.
Bloem said some whistleblowers who spoke out against corruption became victims through suspension.
"Unsurprisingly, those senior officials implicated by (former Bosasa COO Angelo) Agrizzi at the Zondo commission are still at work and continuing their normal duties," Bloem said.
Cope deputy president Willie Madisha denied that the party had highlighted the plight of the workers only because this was election season.
"Politics plays second fiddle. People of our country come first," Madisha said.