The prosecutor had first argued against granting bail to Jayalalithaa and later had allegedly reversed his stance expressing no objection to a conditional bail to convicts.
The bail plea was heard and decided on October 7.
"The judge who heard the case has referred to the reversal of stance and observed that the convicts cannot be enlarged on bail given the gravity of their offence," Karunanidhi said in a letter to the party cadre.
"Will he answer if what the judge observed in his ruling (denying bail) was a commendation," he asked.