In a background article in the Times of London about KGB and soviet allies trying to cultivate spies in the 70s and 80s in Britian, there is mention of lunching, flattering and paying contacts in red gold. Later it mentions the guardian writer richard gott who was in contact with kgb in the 60s and 70s said he took red gold in form of expenses. Was red gold a euphemism for bribe/gifts? If so was the most common form of giving bribes/gifts?
Can you give us a whole sentence?
Otherwise I'd just assume that "red" meant supplied by the Soviets and "gold" is another way of saying cash.
You can never be sure without seeing the source, but I assume that was червонное золото, which can be directly translated as "[archaic word for red] gold", but the proper translation would be "pure gold".