Abarth was sold to Fiat in 1971 and the racing team sold to Enzo Osella[?]. Abarth became the racing departement of Fiat. Some model build by Fiat or it's subsidiaries Lancia and, Autobianchi where co-branded Abarth, the most famous being the Autobianchi A112 Abarth.
Links
wikipedia.org dumped 2003-03-17 with terodump