General Motors logo at the company's world headquarters in Detroit. (Photo: AP)

General Motors is suing Fiat Chrysler, alleging that its crosstown rival got an unfair business advantage by bribing officials of the United Auto Workers union.

The lawsuit, filed Wednesday in US District Court in Detroit, alleges that FCA was involved in racketeering by paying millions in bribes to get concessions and gain advantages in three labor agreements with the union.

Details of the racketeering have been exposed in a federal probe of corruption at the union that has resulted in multiple arrests.

The lawsuit alleges that Fiat Chrysler corrupted the bargaining process with the UAW in the 2009, 2011 and 2015 union contracts to gain advantages over General Motors.

Craig Glidden, GM’s chief counsel, alleged that Fiat Chrysler CEO Sergio Marchionne, who died last year, was a “central figure” in the conspiracy, which was designed to put GM at a cost disadvantage to FCA.

“FCA was the clear sponsor of pervasive wrongdoing, paying millions of dollars in bribes to obtain concessions” from the union, Glidden said. “FCA’s manipulation of the collective bargaining process resulted in unfair labor costs and operational advantages for it, causing harm to GM.”

A message was Wednesday left seeking comment from Fiat Chrysler.

In addition to Fiat Chrysler, the lawsuit names former FCA labor relations chief Alphons Iacobelli, and former FCA officials Jerome Durden and Michael Brown as defendants. All have pleaded guilty in the federal corruption probe, which has alleged that Fiat Chrysler bribed UAW officials to keep them “fat, dumb and happy.”

Authorities have alleged that payments were made through a training center jointly run by the company and the UAW. Durden handled the training center’s finances, and Brown helped run the center.

Glidden told reporters that in the three UAW contracts, FCA was able to reduce its labor costs because the union allowed it to hire more temporary and lower-paid workers than GM.

“Many of the advantages FCA was able to obtain were denied to GM. That was part of the conspiracy,” Glidden said.

In 2007, the union agreed that new hires would be paid less than longtime workers, setting up a “second-tier” of employees who were paid less. FCA had more second-tier workers than either of its Detroit competitors.

Glidden said GM is not suing the UAW because it believes that responsibility rests with FCA, which was the “orchestrator” of the conspiracy. He accused FCA of mismanagement of “stunning proportions” and should be held accountable.