Have you not seen James Bond?
Spies during WW2 could go around with explosives and plant them places to blow stuff up...
Tanks - Easy, Strap some C4 to them. If there stored underground then blow the hanger up...
Nukes - Errr... Strap C4 to one in a Silo! Your a Spy FFS you can get in and out!
CM's - Same as nukes...
Infra - Blow up Bridges Roads ETC... Thats infrastructure!
Tech - Blow up that high Tech lab out back...
Change religion - Hard one...You certainly can influence people...
Change Goverment - Assasination, infulencing people.
Steal Tec - Remember that Tech lab? walk in and walk out with aload of new things =P
Defcon - Your a spy... Defcon is controled by a computer...
Destroy moneys - Computers... get into the mainframe and send it to someone (makes me wonder why you cant steal cash... thats more impossible)
& as for the hippies in Peace mode... Serves 'em right...