Best Investigation movies of 1970s

Actors : Evert Anderson, Anja Schmidt, Thommy Berggren, Kelvin Malave,
Directors : Bo Widerberg,

About the life and death of the legendary Swedish/American agitator Joe Hill.

Actors : François Périer, Stefania Sandrelli, Simone Signoret, Yves Montand,
Directors : Alain Corneau,

An inspector is having a secret relationship with a woman. When she is murdered by his boss, all proof is against him.

Actors : Franco Fabrizi, Giovanna Ralli, Claudio Cassinelli, Mario Adorf,
Directors : Massimo Dallamano,

Police investigate apparent suicide of teen girl and uncover details of a teenage prostitution racket. They go on the hunt for a motorcycle riding killer.

Actors : Silvia Monti, Wolfgang Preiss, Franco Nero, Ira von Fürstenberg,
Directors : Luigi Bazzoni,

An alcoholic journalist finds himself on the trail of a murderer after the police make him a suspect in their investigation.

Actors : Hector Elizondo, Susan Blakely, Michael Moriarty, Yaphet Kotto,
Directors : Milton Katselas,

Police officer Patty Butler, alias "Chicklet," is the live-in girlfriend of Thomas 'Stick' Henderson to gather evidence. Detective Bo Lockley is instructed to try to find her, not knowing she's also a cop.

Actors : Barbara Babcock, Paula Prentiss, Harry Dean Stanton, Robert Foxworth,
Directors : Harold Becker,

A romantic comedy which explores the pressures on police officers.

Actors : María Kosty, Víctor Petit, Sandra Mozarowsky, José Antonio Calvo,
Directors : Amando de Ossorio,

In this final installment of the Blind Dead series, a doctor and his wife move to a small inhospitable coastal village where he plans to start a practice only to discover that undead demon-worshiping Templar Knights haunt the place.

Actors : Roger Davis, Stuart Whitman, Janit Baldwin, Piper Laurie,
Directors : Curtis Harrington,

Sixteen years after Ruby Claire's gangster boyfriend was shot and killed by four associates, a series of gruesome murders takes place at the drive-in movie theatre she now owns. Meanwhile, ...

Actors : James Westmoreland, Nicholas Worth, Ben Frank, Flo Lawrence,
Directors : Robert Hammer,

A deeply disturbed Vietnam veteran terrorizes the young women of Los Angeles and taunts a radio psychologist with descriptions of his grisly crimes.

Actors : Ryouko Ima, Yayoi Watanabe, Yumi Takigawa, Emiko Yamauchi,
Directors : Noribumi Suzuki,

In order to investigate her mother's strange death, a woman enters a sacred convent run by hypocritical, perverse nuns.

Actors : Raymond St. Jacques, Calvin Lockhart, Judy Pace, Godfrey Cambridge,
Directors : Ossie Davis,

Gravedigger Jones and Coffin Ed Johnson are two black cops with a reputation for breaking the odd head. Both are annoyed at the success of the Reverend Deke O'Mailey who is selling trips ...

Actors : Steve Vincent, Douglas Gudbye, John F. Goff, Verkina Flower,
Directors : Stu Segall,

Two police detectives try to catch a serial killer who is stalking a rural California drive-in theater, randomly killing people with a sword.

Actors : Barbara Steele, Avery Schreiber, Cameron Mitchell, Rebecca Balding,
Directors : Denny Harris,

During her first semester at college, a co-ed finds housing at a seaside mansion where, following the death of a fellow-student, she becomes entangled in a murder mystery surrounding the property and it's secretive tenants.

Actors : Serene Hedin, James Remar, Trevor Howard, Nick Ramus,
Directors : Kieth Merrill,

An ancient Indian warrior who has reached the end of his life is brought back from his 'death' to save his family from a raiding party of enemy Indians in this unique story of 'Indians ...

Actors : Mimsy Farmer, Barry Primus, Ray Lovelock, Carlo Cattaneo,
Directors : Armando Crispino,

A pathology med student and a priest team up to investigate a wave of suicides blamed on sun spots and discover a number of them to be actual murders.

Actors : Shane Briant, Yvonne Mitchell, Gillian Hills, Robert Hardy,
Directors : Peter Sykes,

A physician discovers that two children are being kept virtually imprisoned in their house by their father. He investigates, and discovers a web of sex, incest and satanic possession.

Actors : Renzo Palmer, Fabio Testi, Orso Maria Guerrini, Vincent Gardenia,
Directors : Enzo G. Castellari,

Nico Palmieri is a police inspector who battles against hoodlums terrorising a sleepy Italian village, extorting cash from the locals.

Actors : Milos Kopecký, Rudolf Hrusínský, Václav Lohniský, Michal Docolomanský,
Directors : Oldrich Lipský,

When the famous detective Nick Carter visits Prague, he becomes involved in strange case of a missing dog and even stranger carnivorous plant. He becomes convinced that he is standing ...

Actors : Ângelo Assunção, Ronaldo Beibe, Andreia Bryan, José Mojica Marins,
Directors : José Mojica Marins,

Psychiatrist experiments LSD on 4 volunteers, to investigate Coffin Joe's influence over them. Each patient presents a different reaction, involving sex, perversion and sadism.

Actors : Cristina Galbó, George Hilton, Antoine Saint-John, Femi Benussi,
Directors : Luigi Cozzi,

Giorgio is a greedy adulterer who makes a deal with a serial killer to dispose of his wealthy wife, Nora. Unfortunately, a thrill-seeking young couple steal the killer's car with Nora's ...