What happened to the parents of Neville Longbottom?

The hero of the Harry Potter franchise is Neville Longbottom.He was raised by his grandmother, who was a full blooded wizard.

The Order of the Phoenix and Frank and Alice Longbottom fought against Voldemort in the first wizarding war.

It is known that they disobeyed the dark wizard three times.The Longbottoms had two children that were foretold in a prophecy, one of which was Harry.