Truck and Barter

I was reading this SI piece by John Ondrasik where I ran across this interesting tidbit:

One of DD's duties is to patrol the American/Cuban border fence here. The NE Gate which was a transit point for Americans and Cuban base workers pre-Castro. After the Cuban Missile Crisis, Castro forbade Cuban citizens to work at Gitmo with the exception of 300 who were already employed at the base. Today only three of the 300 are left, crossing through the NE gate daily