[upfrog]

Don't assume that your history would be an immediate dealbreaker. With enough time, they are happy to ignore a lot of that stuff. Just be honest.

Of course, if you don't believe in any of the causes you might need a clearance for, it doesn't matter, but don't be too quick to make that assumption either. A lot of stuff gets classified by the government, and not all of it is morally noisome.