A good start (and relativly cheap) would be signs backed by concertina wire backed by anti-personell mines and and trip flares backed by more barbed wire backed by M2 .50" BMG positions with night vision and free-fire orders.
Check for the Berlin Wall schematics...they should help you.
The Berlin Wall kept people from ESCAPING, you stupid ******* communist piece of shit.
That is communism folks. They build their walls to keep people from getting out.
Where free market countries are so prosperous that they need walls to keep motherfuckers out.
Bodecea and pieces of shit like him (the dumbest ******* people on earth, American socialist cocksuckers) are actually trying to compare the Berlin Wall and it's purpose to the wall that clearly needs to be built between the US and ******* Mexico.
Stupid ******* ignorant losers.