Radio markets more or less exist in US too, they are called "Flea Markets". They are not as narrowly focused on selling electronics, but Soviet "radio markets"

Radio markets more or less exist in US too, they are called "Flea Markets". They are not as narrowly focused on selling electronics, but Soviet "radio markets" too, were usually adducts to normal flea markets, selling old glassware, clothes and other random crap.