Unite joined the protest in London against the closure of the company which makes black cabs.
Unite's Peter Rose said: "We're here today because we want to campaign to keep the black cab built in Britain. It's been here for over 70 years and we want that to continue. It's a London icon, deserves its place in London."
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A woman died as she crossed the road when she was struck by four separate motorists who police believe did not stop.
Patrols including local volunteers have been set up after the grisly finds in Thamesmead in the last month.
Thieves targeted a property in Richmond on Monday afternoon.