The supreme court has effectively removed all of the possible mechanisms to sue ICE or DHS and hold them accountable, with the sole exception of having the DOJ prosecute them on your behalf, which is of course never going to happen. The only remaining possibility to hold them accountable for crimes appears to be within the states judicial systems- but most are currently setup to not allow this, deferring to the federal mechanisms which only very recently stopped existing.

This Vox article and the podcast with the same name does a good job of explaining how it is now effectively impossible to hold ICE accountable to the law: https://www.vox.com/politics/464962/supreme-court-ice-no-law