Edit: If the downvoters want to tell me where I’m wrong, I’d be glad to be corrected.
Fifth amendment to the constitution states: "nor shall private property be taken for public use, without just compensation" meaning this proposition is straight up unconstitutional unless they amend it to pay. And i assume Bernie do know constitution of his own country so i have no clue how he proposed it like this unless it is to stir a shitstorm about "seizing" and then amend it as "compromise".