They did though, through the creation and expansion of the secure communities program.. It was attempted to be walked back via the PEP after Obama earned the “deporter in chief” moniker, but yes the DNC did, has and will continue to do so.
Their style is usually more “don’t make a scene” then “suns out, guns out” but the end result is ultimately the same.
Public database of rich people spending money on disinformation tactics: https://www.opensecrets.org/elections-overview
Where do you get that idea?