Firstly, you would put yourself in your enemies mind and work out your own Vulnerable Points (VP). You would then - armed with this information - develop a sophisticated security department, whose sole job would be to analyse and expose any agents who work against your interests, just like the Brits have. It would be manned by dedicated and trustworthy individuals and rotated and at unpredictable intervals to disrupt any long-term infiltration. Republicans would know that the one unit in its army that could cause the most harm if compromised would be the Security/ Intelligence Department. What did the IRA do under Adams/McGuinness leadership? It established a unit manned by one ex-British marine ( J J Magee) and promoted Freddie Scappaticci to his deputy.
Now either Adams and McGuinness are the two unluckiest people on this planet or it was no accident.
Thanks that is an interestign read.
Havent gotten to the second link yet.