Software Piracy!
An undocumented immigrant
Purchasing products from other countries is generally called importing. Exporting is when you ship products out from your own country to others. Illegally purchasing products from another country and sneaking them is is called smuggling.
It is called poaching or to poach.
Counterfieting
smuggling
poachers
A bootleg.
Plagerizm
They were called 'bootleggers'.
They were called wetbacks.
Smuggling is the name given to importing and exporting goods illegally.