Agency workers at the Halewood Jaguar Land Rover (JLR) car plant were told they were losing their jobs on Christmas Eve.
The employees may now have to seek redundancy settlements after they were informed the staffing levels were being looked at.
It comes just 12 months after the firm took on an additional 1,500 people to deal with the launch of the Range Rover Evoque model.
A man whose son was affected by the announcement told the Liverpool Echo that "no one had any inkling about it".
Some 50 workers in total have been handed their notice and a spokesperson for the car manufacturer - which has offices in Warwick and Coventry - stated that it was commencing "a phased plan to reduce the number of additional agency workers in stages to align with the longer term workforce commitment".
The representative continued by saying that the process of making employees contracted to JLR will continue into 2012.
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Posted by Trusha Vyas