2nd Espionage Campaign Mission - How to stop spies ?

[ImperiumRome]

Like title said, I'm tired of enemy spies blowing up my Rum factory, and those things are expensive ! They never destroy anything cheap, like restaurant or house, oh no, it has to be the most expensive building on the island !!!! I built a Spy Academy, I think it helps a little, but I don't know how to effectively stop the spies ? Anyone could help me ?

Thank you so much

[Jet City Gambler]

Build a few of those Radar Dishes, those will help counter the spies infiltrating your island.

Also bribe the Foreign Spies on your island, they will then help sabotage operations against your regime.

The Spy Academy doesn't seem to help much for counter-espionage, they're mainly for offensive attacks against the superpowers.

[Sapphire Bullets]

Use police stations, checkpoints and dungeons and Agent managers to identify foreign spies.
Look into the People tab of the Almanc and then deal with them by means of your choosing.
If you bribe them, as JCG says, they will help hinder the next operation against you by their power.

[League of Legends Player]

Arrest 15 spies at a time, and before that you should build a machine gun complex with 10-20 machine guns and prepare for a uprising