Yes.......And in fact, depending on the size of the supplier, the UAW demands that Ford only accept parts from suppliers who are staffed with UAW employees......
Here's a little insight on how Ford and their UAW works. My company was a tier I supplier of body parts to Ford for well over 75 years. Back in about February of 2006, our Shelbyville KY stamping plant went out on strike, which had the potential of shutting down Ford's Ky truck plant due to lack of parts.
After a weekend and two days of strike and negotiations, Ford stepped in and told our corporate sales department that if the strike was not settled IMMEDIATELY, they would pull their body dies out of the plant and give our multi-million $$$ contract to a competitor. That ended the strike, the local union got every single demand they asked for and our parent company, who were German based, said screw it, they had no desire to deal with the unions here so they sold off our company...........
Here's another example: Our Detroit stamping plant was offered for sale back in about 2005 and an investment group consisting of ex mayor Dennis Archer and Dave Bing, CEO of Motor City Stamping, were considering buying the plant, taking advantage of the black "Empowerment Zone" tax breaks being offered by the city of Detroit. Ford again stepped in and told our company as well as the potential buyers that since the new group could not guarantee the continued production agreement between my company and Ford, that they were going to pull the work out of the plant and do it in house until their other suppliers could tool up to meet their parts requirements.
The sale fell thru and our plant was ultimately closed down............
Unless the supplier is foreign?