Both the football club and the carmaker are controlled by the Agnelli family through their holding company.
"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", a statement from the union said. The USB trade union called the acquisition unfair, announcing a strike spanning three days.
The five-time Ballon d'Or victor confirmed the move to Serie A on Tuesday, ending a nine-year stay in Madrid which featured four Champions League titles in the past five years. Added to that the likelihood that he will strengthen the team, it seems plausible that they will be more successful domestically and qualify routinely for the Champions League.
Sponsors Fiat agreed to shoulder the burden of his £26.6m-a-year wages, helping to ease money fears but the total cost to club will be £310m over four years.
Ronaldo joined Real Madrid in 2009 from Manchester United and was the Spanish club's all-time leading scorer with 451 goals in 438 matches.More news: Women's March mocked for press release opposing Supreme Court nominee 'XX'
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Portugal was eliminated by Uruguay in the round of 16 of this year's tournament in Russian Federation.
"It was Cristiano Ronaldo who was the first to believe in this operation, the first to launch it".
It's calling for a strike the Melfi plant in southern Italy between 10 p.m. on July 15 and 6 p.m. on July 17.
Its members will walk out at 22:00 local time on Sunday and remain on strike until 18:00 on the following Tuesday.
FCA, whose plants churn out Jeep SUVs, sporty Alfa Romeos, luxury Maseratis and tiny Fiats, had promised to bring all employees in Italy back to work by the end of 2018, but that goal slipped as investments and product launches were delayed.