Well, he didn't exactly say that but then again it's not clear FDR actually made such a statement either. But Biden, in his video message relating to a unionization vote at an Alabama Amazon warehouse made clear where his sympathies lie and warned Amazon not to try to manipulate the vote. That's a big deal by the standards for American presidents for a very long time.
We'll see if Biden keeps it up so the headline here really does seem the message to workers. If so, that could easily be one of the most consequential parts of Biden's Presidency. Right now, the private sector unionization rate is only 6.3 percent, so there's a very long way to go. But perhaps Biden's intervention is a harbinger, at long last, that a more favorable environment for union activity has arrived.