Despite improvements, working conditions are still a sore point in China -- and China Labor Watch wants to emphasize that no company is exempt from scrutiny. The rights advocacy group claims that, on top of pushing mandatory overtime and poor overall conditions, Samsung contractor HEG Electronics has allegedly been employing at least seven underage workers at a Huizhou plant making phones and DVD players. Not surprisingly, Samsung has been quick to defend itself, asserting that it found "no irregularities" in two separate inspections this year and that it plans a third as a response to the new accusations. Who's telling the truth is still up in the air, although China Labor Watch is taking aim only after going undercover; it's long been suspected that contractors whitewash their labor practices when they see corporate inspectors coming from a mile away. If there's any substance to the allegations, Samsung may be the next tech giant taking action to mend a bruised public image.