Amazon is planning to use electronic bracelets to keep tabs on workers and optimise their performance, Geekwire said Thursday.
The news caused an uproar despite a lack of confirmation from the online retail giant.
Susanna Camusso, head of Italy's biggest and most leftwing union CGIL, said the news "comments itself".
UIL union chief Carmelo Barbagallo called it a "disgrace".
CISL union head Annamria Furlan said "work shoudl respect the dignity of people, not this".
Giorgia Meloni, leader of the rightist Brothers of Italy party, said it would turn workers into "slaves".
Amazon's Italian workers are already up in arms about conditions and struck on Black Friday.
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