Hundreds of families of September 11th victims who have wanted to sue Saudi Arabia for their alleged role in the terror attacks may finally have their day in court.

A lawsuit accuses the country of providing funding and resources to al-Qaeda for terrorist activities including training camps, safe houses, weapons and false passports.

The families say Saudi Arabia's support of the organization directly caused the deaths of more than 3,000 people.

Fifteen of the 19 hijackers were Saudi nationals.

Last year, Congress passed a law that says no nation is allowed to conspire to carry out acts of terror against Americans on U.S. soil.

The families say they're grateful that this change in sovereign immunity laws will allow a case like this to move forward for the first time.

"We've been screaming for 15 years, 'Saudi Arabia's been involved, Saudi Arabia's been involved.' But it seems nobody wants to listen to us or do anything about it. And I think there's a little bit of vindication behind it," said Brett Eagleson, the son of a September 11th victim."

"They provided direct support," said plaintiff counsel Andrew Maloney. "It wasn't just one or two rogue employees. There was a pattern of support and sympathy for al-Qaeda."

The suit seeks unspecified monetary damages.