Did you catch the trick?   MSW defines alt reich by citing Richard Spencer, and then suggests that this Spencerian movement is quite popular across America.

But there's no evidence that's so.   When Spencer last gave a talk, 200 people showed up.

200 people?

If Spencer is the leader of a huge movement that truly threatens America,  where are the followers who, like Spencer, quote from Nazi literature and disparage Judaism?

MSW doesn't say.   But he does say this:

"Let those of us in the Catholic left help some of our more extreme colleagues on the left see how their antics provide kindling for the alt-right and let our conservative Catholic friends do their best to take away the alt-right's matches."

I'm guessing that what Mr. Winters is referring to here is the recent UC Berkeley riot that shut down gay Catholic Milo Yiannopoulos.    

But I'd only be guessing, as he won't cite particulars.   Wonder why?

Could very well be MSW is more afraid of the left than of the alt reich.