The ruling bloc bulldozed a contentious bill to revise the worker dispatch law through an Upper House committee Tuesday, clearing a critical hurdle for its enactment that will enable companies to use temporary workers for as long as they wish.

With the committee's approval, the full Upper House is expected to vote on the bill Wednesday and send it on to the Lower House, which could pass it as soon as Thursday. Under that scenario it would take effect Sept. 30.

The law in its current form puts a three-year limit on the use of temporary workers dispatched from staffing agencies to do the same job, except for those engaged in 26 specific jobs designated as requiring specialized skills, such as translators and secretaries.