We would usually say “the ones I spied on”. English is the only language I’ve ever spoken and although it sounds weird to not include the word “on”, I really dont see why its necessary either.
Because “spied for,” and “spied with” are both options.
“I spied them” is a legitimate sentence, but it doesn’t mean covert surveillance in that sentence, only to have seen then, generally through some difficulty.
We would usually say “the ones I spied on”. English is the only language I’ve ever spoken and although it sounds weird to not include the word “on”, I really dont see why its necessary either.
Because “spied for,” and “spied with” are both options.
“I spied them” is a legitimate sentence, but it doesn’t mean covert surveillance in that sentence, only to have seen then, generally through some difficulty.