They were accused of 'spying' for a foreign government.
a 'spy' camera/plane [=a camera/plane used for spying]
a 'spy' novel/thriller [=a novel/thriller about spies]
(..) Peabody, here. I've come for Sherman. Do you know this guy? I thought I did... but now I'm not so sure. Then he must be a spy. Kill him! No! No! He's my dad. Your dad? Huh? (..)2014 Mr. Peabody & Sherman