“Gomorrah” writers Leonardo Fasoli and Maddalena Ravagli are set to explore the string of murders perpetrated by Italy’s so-called White Uno Gang in a gritty crime thriller produced by Riccardo Tozzi (“Gomorrah”) and Pietro Valsecchi (“Quo Vado?”).

The White Uno Gang was a criminal organization made up mainly of police officers with ties to the far right that was active during the 1980’s and the 1990’s. The gang — whose name refers to the Fiat Uno car, which its members frequently used – operated in Italy, mainly in the central Emilia-Romagna region. Between 1987 and 1994, the White Uno Gang pulled off 103 heists, mostly armed robberies, causing 24 deaths and 102 injuries.

Though the gang leaders have been caught and brought to justice, their extreme violence and the fact that many of their heists brought small loot have prompted suspicions that they were in fact terrorists, possibly tied to Italian secret services.

Investigators, including an Italian parliamentary commission,...