The GMB union has welcomed Ed Miliband's recognition of zero-hours contracts "exploitation", but said the Labour leader's proposals are "a long way from where we need to get".
GMB general secretary Paul Kenny said the safeguards pledged were "a starting block to get proposals that are fit for purpose."
"Those at the top getting more than their fair share is the major reason for the growth in precarious forms of jobs like zero hours, bogus self-employment, agency and temporary work, very short hours, part time jobs, flexible and casual employment," he added.
More top news
How is Sainsbury's positioned to tackle the challenges of low-cost rivals and changing shopping habits?
The head of football's anti-discrimination body Kick It Out has responded to attacks by QPR defender Rio Ferdinand in his autobiography
Prime Minister David Cameron and his wife Samantha surprised diners in Solihull by dropping into fast food chain Five Guys for burgers.