Best Investigation movies of 1970s

Actors : Michael Hawkins, Mary Cannon, Doodles Weaver, Sid Rancer,
Directors : Will Zens,

A young man takes up truck-driving to investigate his trucker father's suspicious death.

Actors : Kaneko Iwasaki, Kunitarô Kawarazaki, Junko Mihara, Gô Katô,
Directors : Keisuke Kinoshita,

A newspaper reporter investigates the lives of juvenile delinquents.

Actors : Yun-kyeong Kim, Sam-ryong Bae, Mu-yeong Kim,
Directors : Ki Kim,

A police detective is barred from a case because of his poor reputation among his superiors. He begins his own investigation into the death of a narcotics officer.

Actors : Mithun Chakraborty, Jeevan, Jagdeep, Ranjeeta Kaur,
Directors : Ravikant Nagaich,

In a bid to locate a missing employee, Jackson, the Central Bureau of Investigation assigns Agent Gopi to locate him. Gopi accepts this assignment and must battle women; venomous snakes; ...

Actors : Min-Yi Huang, Ya Ying Liu, Yat Fan Lau, Wai-Man Chan,
Directors : Shen Liang,

When Wang Chung decides to leave his life of crime, his boss won't let him go, so he commits a series of heinous killings, and fabricates evidence, suggesting Wang is the murderer. Wang ...