The Killing of Angel Street 1981

A geologist returns to Australia to find her retired father in a bitter public fight to save the historic Sydney waterfront houses. After her father's mysterious death, she joins forces with local residents and a union to fight corruption.
Worth noting that in reality the BLF (Builders & Labourers Federation, now outlawed) helped in the beginning and then were bribed and stopped their action, fortunately the Water Board Union stepped in.
Juanita Nielsen is still missing presumed dead, murdered on organised crime figure Abe Saffron's order, Corrupt police or by Union men.
Touches on things that need to be remembered. There's another film on this matter called Heatwave.