I'm not the world's biggest fan of Paul Krugman - an economist so neo-Keynesian that the blame for so much that has gone wrong in the economy is easy to attach to his thinking - but on this I agree with him:
And yes, he really did mean 'locking up'.
For the record, he is not alone in living in fear of that possibility.
When the fascists call out 'lock them up' they really mean it. It inevitably follows that someday, sometime soon, some of them are going to start doing it. It's the way these things always progress.
So why not live in fear of it? And defy it, at the same time?