NRA

The National Rifle Association (NRA) advocates for gun rights, but it is funded largely by gun manufacturers and others in the gun industry. The organization is known for making or breaking political campaigns and funding those who it is able to successfully lobby. The NRA has become increasingly extreme since its founding.

The NRA officially opposes a national database of gun owners and encourages its members to do the same. However, the NRA itself has its own national database of gun owners that keeps tabs on "tens of millions" of people.
 * 2/23/15 - NRA’s Revenue Has Skyrocketed Since The Sandy Hook Massacre

Resources

 * Mother Jones Magazine: Decades of NRA Ads Show Organization's 'Descent Into Crazy'
 * Images and video illustrating the change in the NRA's positions since its founding.