undercover surveillance

His masterpiece 'The Conversation' (1974) is the definitive exploration of surveillance paranoia, following a guilt-ridden wiretapper consumed by moral ambiguity.

His psychological thrillers like 'Blow Out' and 'Body Double' obsessively examine voyeurism, hidden observation, and the voyeur's complicity in surveillance.

'The Lives of Others' (2006) penetrates the soul of state surveillance through a Stasi informant's transformation, examining how surveillance corrodes humanity itself.