Prying eye: Tate Modern's Exposed uncovers the art of secret photography

Couple Kissing, Girl Staring at Camera, Tortilla Factory, New York by Garry Winogrand (1969)
Photograph: Garry Winogrand/Fraenkel Gallery, San Francisco

A young man called Amos Gexella looks back towards safety while perched on the sixth-floor balcony of a building in downtown Johannesburg, 4 August 1975. An estimated 2,000 onlookers yelled: 'Jump! Jump!' Two hours later, Amos rolled off the parapet and fell to his death
Photograph: AP

Greta Garbo in the Club St Germain, Paris, in the 1950s
Photograph: Georges Dudognon/San Francisco Museum of Modern Art

Anita Ekberg and husband Anthony Steel, photographed in 1958
Photograph: Tazio Secchiaroli/David Secchiaroli

Golf Five Zero watchtower, known to the British army as Borucki Sanger, at the Crossmaglen security force base in South Armagh (1999)
Photograph: Jonathan Olley/Diemar/Noble Photography

Shizuka Yokomizo's chromogenic print, Stranger No 2 (1999)
Photograph: Shizuka Yokomizo/San Francisco Museum of Modern Art

What Makes Jackie Run? – Ron Galella’s snatched image of Jackie Onassis running (as if fleeing the camera) in New York’s Central Park in 1971 remains emblematic as a celebrity photograph
Photograph: Ron Galella

Walker Evans's Street Scene, New York (1928) captures strangers in the night
Photograph: Walker Evans Archive/The Metropolitan Museum of Art