Well, they are gun grabbers so I suppose the title question is rhetorical.  But they call themselves Freedom States Alliance but they are actively working to limit freedom.  I got an email from them that, in part, says:

As we continue to fight to end the terrorist threat posed by .50 caliber sniper rifles, we work hard to ensure that you’re kept abreast of all the latest developments in our struggle.  We are drawing a line in the sand and telling powerful special interest groups that there is no place for battlefield weapons in civilian hands.  There’s plenty that you can do to help!

…

This campaign has only just begun, and we’re picking up momentum.  The NRA and its friends in the gun industry declined comment because they know this is a battle that they will lose.  These guns are not your grandfather’s hunting rifles.

With so much success after such a short time, we just wanted to take a moment to thank each and every one of you for your help.  And if you’re a supporter of the campaign, won’t you consider helping to spread the word to your friends and family?  Or make a donation at our website to help us get the message out.

We must stop .50 Caliber Terror.  It’s just common sense.

What does “Freedom States Alliance“ mean?  Could it be they deliberately left it ambiguous so both those for and against freedom would feel comfortable contributing to their cause? 

How many crimes have been committed in the U.S. in the past 30 years using a firearm that shoots the .50 BMG cartridge?  One?  Maybe two?  How many terrorist acts have been committed in the U.S. using a firearm that shoots the .50 BMG cartridge?  Zero–right?  They say, “We must stop .50 Caliber Terror.“ but what is there to stop? 

They have no common sense.  They only have their blind hatred and an alliance against freedom.