Staff at Sports Direct warehouses face a "six strikes and you're out" policy if they breach a set list of offences, including "excessive talking" and taking too long in the toilet.
The Unite union criticised the list for establishing a culture of fear.
Speaking to MPs ahead of Mike Ashley's appearance, the union criticised the retail chain's bosses for displaying "arrogance and contempt".
ITV News Business Editor Joel Hills tweeted:
Union says the agencies that employ 3000 people at @sportsdirectuk warehouse also charge them for pre-pay debit cards and insurance.
The union spoke of "arrogance and contempt" at the top of @sportsdirectuk Next up are the recruitment agencies who provide staff.
Union leaders also confirmed talks had been held with HM Revenue and Customs about back pay for workers at Sports Direct amid claims of underpayment.
They also disclosed that workers who do not have a bank account have their wages paid via a debit card which they have to pay for.
Mike Ashley, the boss of Sports Direct, arrives at Portcullis House in London where he will give evidence to MPs.
Steve Turner, from Unite Union, is giving evidence to MPs on Sports Direct's working practices.
He claimed the firm's business model had "exploitation" at its heart as he criticised the number of staff on zero hours contracts.
Sports Direct boss Mike Ashley will give evidence shortly.
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BHS administrators have failed to find a buyer and will begin winding the company down, putting 11,000 jobs at risk, adminstrators Duff & Phelps has said.
BHS has 11,000 employees across 164 stores.
11 stores are in the North East, putting the jobs of around 550 employees at risk.
The North East stores are in:
- South Shields
- York (2) Coney Street and Monks Cross Retail Park
Philip Duffy and Benjamin Wiles, Managing Directors of Duff & Phelps, the administrators said:
Our thoughts today are with the employees. We thank them for their professionalism and hard work. We would also like to thank the great British public for helping us in our efforts to save BHS resulting in several weeks of significant sales.
As a result of the wind down all 163 stores will be in close down sale mode over the coming weeks and whilst continuing efforts will be made by the administrators to sell stores the jobs of 8000 members of staff are likely to go. A further 3000 jobs of none BHS employees who work in the stores may also be at risk.
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