Silent Action (1975) – Sergio Martino.

A number of wealthy, powerful men from the higher echelons of society are found dead, apparently of suicide, dogged inspector Solmi (Luc Merenda) is unconvinced, very soon exposing a bloody conspiracy that threatens to topple the nation's king makers. A smart, powerfully acted, tremendously exiting thriller, action-packed, and politically astute, Silent Action's gripping plot drives relentlessly forward with a Giallic intensity! Italian genre maestro Sergio Martino's compelling, masterfully muscular poliziotesco remains one of the very finest, absolutely timeless, prodigiously entertaining cinema, Silent Action's explosive central premise is certainly no less pertinent today.