Credit card rewards are about to vanish, and guess who’s to blame?

With summer vacations just around the corner, millions of Americans are getting ready to cash in their hard-earned credit card rewards: points, miles and cash back they’ve accumulated all year to help cover flights, hotel stays and rising costs at the gas pump. I would know, as I’m one of them.

But what if those rewards suddenly disappeared overnight?

That’s not a hypothetical. It’s the imminent consequence of a growing political movement – mainly flying under the national radar –...