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Sean "Diddy" Combs is being put to work behind bars, and his first federal prison job has him doing the ol' fluff n' fold.

Sources familiar with the situation tell us Diddy's first gig at FCI Fort Dix in New Jersey plants him in the laundry room ... washing and drying dirty clothes. Federal Bureau of Prisons

Manual labor may come as a shock to Diddy ... during his criminal trial, federal prosecutors claimed he couldn't even charge his own phone or fetch a bottle of water, and would send his army of personal assistants to basically do everything for him.

We broke the story ... Diddy was transferred to FCI Fort Dix early Thursday morning to begin the check-in process.

The federal prison is low security and conditions there are much better than MDC Brooklyn, where he'd bee

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