Goldman-Sachs was a major player in the destruction of the Greek economy. They set up unsustainable loan arrangements and then bet that Greece would not be able to pay them off.
Goldman Sachs arranged swaps that effectively allowed Greece to borrow 1 billion Euros without adding to its official public debt. While it arranged the swaps, Goldman also sought to buy insurance on Greek debt and engage in other trades to protect itself against the risk of a default on those swaps. Eventually, Goldman sold the swaps to the national bank of Greece.
In light of this combination of arranging structured financing while shorting the customer's debt, Goldman may find itself in a familiarly uncomfortable public light. Goldman has come under a barrage of criticism for structuring mortgage backed securities while its traders shorted that market.
They pulled the same scam on US home buyers that they pulled on an entire country. They originated loans that they knew were going to default. They made money doing that. Then they sold the loans to another sucker. They made money doing that. Then the bet that the loans would fail. They made money doing that as well. In the end, both the US home buyers and an entire country were left with unpayable debts.
Goldman-Sachs was monumentally predatory. As the article says:
Goldman was uniquely well-positioned to understand that Greek debt service obligations were higher than they would have appeared just by looking at its official debt levels, making Greece a riskier credit. This knowledge may have allowed Goldman to acquire credit protection on the trades on the cheap.
If you read the full article it's full of excuses why Goldman was not really a bad actor, but you must remember the source is the Business Insider, and they would happily support selling children into sex slavery if it was legal because Profit!
It's a pure swindle. Goldman had the deck stacked and the cards marked. Even a sovereign government was not up to understanding how a huge banking institution was able to manipulate the financial system to squeeze them dry and avoid any responsibility.