Workers producing sportswear for Olympic sponsors Adidas, Nike and Puma are beaten, verbally abused, underpaid and overworked in Bangladeshi sweatshops, a shocking investigation has discovered…A Nike spokeswoman said…We are investigating the allegations…and will be back to you as soon someone in our sustainable manufacturing team has made an assessment."…Adidas said…it was "deeply concerned about reports of harassment or physical abuse of workers" and would immediately launch an investigation "to verify the allegations…"...Puma said it had found evidence of illegal overtime in one of its supplier factories named in the…report, but said the factory had offered assurances that it would tackle the problem...