A quick way to check if your country has been taken over by terrorists is to see if your freedoms are being slowly taken away.
Standard methods of fighting back simply will not work.

There's only a few things an evil like this will truly understand.
Let them know that they will not get away with enslaving and genociding us free and clear.

Here is something that can be done to put these monsters in check.
Take used vehicle fluids such as radiator fluid and especially used motor oil and dump this in lakes, rivers, streams and reservoirs. As an alternative whatever chemical you can find may be useful. Take extra caution as to not be seen.
There is little else will act as an effective deterrent.