The BBC's undercover reporter worked in the Fashion Waves Ltd factory in Manchester.
She discovered that the company was being sub-contracted by TNS Knitwear, which supplies some knitwear to Primark.
This is some of the secret footage she gathered while working there.
Fashion Waves denies employing illegal workers.
Primark says it is "extremely concerned about the very serious allegations" and is "conducting its own investigation".
"Primark had TNS independently audited on 28th April and 10th December 2008… and had a strict... programme in place in relation to identified breaches of its Code of Conduct."
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