Clarification about 'scabbing'

An astute and well-respected reader recently made the comment to me that my post about the highway workers strike in Saskatchewan contained a small error. I referred to managers who were serving as replacement workers as scabs. The definition of scab- that is a replacement worker hired by management to perform the work of a striking- cannot include management, as the managers are already employed at the firm anyways. While this is correct, I am still much opposed to the work of strikers being done by management, even if they aren't scabs. Perhaps we can find a new word to classify these 'replacement workers'...