Auto behemoth Fiat are based in Juve's home city Turin and both are co-owned by the Agnelli family.
But while the club and the vehicle company are separate corporate entities, individually managing their own operations and finances, the Italian USB Lavoro Privato union considers it "unacceptable" that such a large investment has gone into securing Ronaldo from the Galacticos.
It's calling for a strike at the Melfi plant in southern Italy between 10 p.m. on July 15 and 6 p.m. on July 17.
A statement released by the union said: "It is unacceptable that while the [owners] ask workers of FCA. for huge economic sacrifices for years, the same decide to spend hundreds of millions of euros for the purchase of a player".
Paris Saint-Germain striker Mbappe has been tipped to follow in the footsteps of his idol Ronaldo, whose transfer from Real Madrid to Juventus was confirmed earlier on Tuesday as the 33-year-old ended his nine-year, trophy-laden spell in the Spanish capital.
Fiat workers plan to strike over Juventus' $131 million signing of Cristiano Ronaldo - saying the auto company should be investing in its employees "rather than enriching only one", according to reports. If Ronaldo can lead Juventus to the UEFA Champions League final, the media exposure for that year alone would be worth about $58.3 million, according to Eric Smallwood, president of Apex Marketing Group.
The union urged Fiat owners to invest in its workforce to bolster the finances of "thousands of people instead of only one".
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