Greeks are master smugglers and shippers. This is their specialty. They prefer to stay in the dark so to speak and don't like attention. But they move tonnes of drugs all over the world.

Some of the largest arms dealers in the world are Greeks.

And oil "smuggling" is also a large money maker. For ex. while Iran has been under sanctions, Greek "businessmen" have been "sanction busting" and shipping Iranian oil all over the world. HUGE profits.

Like I said, smuggling and shipping (drugs, weapons, cigarettes, oil) are their speciality. With as little or no attention as possible. And always trying to portray themselves as "businessmen".