There have been several federal laws passed since, but the only major one enacted since the Gun Control Act was the 1994 Assault Weapons Ban (aka The Brady Bill) which outlawed civilian ownership of assault weapons and instituted federal background checks for those purchasing guns. These laws are not radical. They're pure common sense. The only shocking thing about them is how recently they were enacted.
If the author had done his homework, he'd know that the AWB has expired...and didn't reduce crime while it was in effect.