Why are common criminals and political prisoners treated differently in the temporary lock-up?

I
will add to the answer provided above.  First
of all, common prisoners are typically small-time
criminals from the prole
neighborhoods. The government in the novel does not seem to worry much
about
the prole criminals, asdescribes them inas "drug-peddlers, thieves, bandits,

black-marketeers, drunks, prostitutes."  One example of a prole criminal who is all
but
ignored is the the heavily intoxicated and overweight woman who sits on
Winston's lap.  Winston
also notes that the overall relationship between the
guards and the common criminals was less
intense than the highly abusive
treatment that the "polits" received.

In addition, this
treatment seemed to extend beyond the holding cell.  Only the
political
prisoners seem to be taken to Room 101 while the common prisoners were allowed
to
curse and joke and offer bribes to the guards.  

Finally, when in the labor
camps, discrepancies continued to exist:
"The positions of trust were given only to the
common criminals, especially
the gangsters and the murderers, who formed a sort of aristocracy.
All the
dirty jobs were done by the politicals."  This treatment seems contrary to what
one
might expect and is because the political prisoners, Outer and Inner
party member, are much more
dangerous to Big Brother's regime. 

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