Fighting in Athens, the capital of Greece, got worse on Sunday night.
It's all because Greece has run out of cash and is being forced to accept billions of Euros from other European countries.
But many Greek people don't agree with the Euro plan because they'd have to stick to tight rules, meaning people a job would have their pay cut.
Over the past few weeks normal life in Greece has got worse for many people.
Some families have started to go hungry because they have run out of money.
Charities and churches are helping to feed people who have no other way of surviving.
Why is Greece in trouble?
Greece has borrowed loads of money over the last 10 years or so - both from European banks and from other countries' governments.
It used the money to run the country, pay for the 2004 Olympic Games and also for things like big pay rises for people who are paid by the government.
But when you borrow money, you have to pay it back, with what's called 'interest' - meaning you pay back more money than you borrowed to begin with.
Then in 2008, the whole world was hit by a banking crisis where all the world's banks were worried they wouldn't get their money back.
The cost of borrowing from banks went up hugely - and Greece had borrowed and spent so much that it couldn't afford to repay its debts.
Greece isn't alone though - all countries borrow money, and Portugal, Spain, Italy and Ireland are all really badly in debt, too.