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I haven't followed the industrial side of it that much. They have been very clear about workers' rights and have most certainly courted business, though. I also don't think they want to end freedom of movement so much as to ensure better workers' rights and similar pay everywhere so that they're not exploited because different countries have vastly different standards. However, I don't really understand what policy Labour has at the moment in relation to all that, and that's obviously part of the problem.
They could take up the cause of all the workers who are going to lose their jobs - for e.g. Nissan, who when they leave will inflict substantial damage on the economy of the North East.
The problem with doing this is that their policies (ending FOM, some sort of cake-and-eat-it version of the single market) is identical to Theresa Mays, and therefore they have no answer.
Labour would need to change their current, stated policy positions relative to CU/SM/FOM, or come up with something that no one else has thought of in order to stop manufacturing draining from the UK to Europe over the next 3-5 years.