Devils in the Schools (1982)

Drowning in debt, former football star Stefanos is utterly unaware that his rebellious, at-risk brother Tasos is dealing with substance addiction under everybody's nose. As a result, while in search of a quick buck and a way out of misery, Stefanos decides to work for a ruthless international drug lord, unbeknownst to him that Tasos and his tight-knit band of schoolmates are already grappling with dependence. When a dear one dies, the untimely demise jolts Stefanos into action, forcing him to embark on a violent mission of revenge and redemption. But can one man alone take down a dangerous, multimillion-dollar drug empire?