Not too long ago the company where I worked was having a similar debate concerning services provided (through an intermediary) to ICE.

One particular facet in the discussion that stuck with me more than the rest was a comment by a co-worker who was visiting from the Berlin office.

They talked briefly about small monuments on the street by their home marking the spots where people were arrested and taken to concentration camps as their time and place of death. They pointed out that in many cases those dates are in the mid 1930s. Up to 10 years before the discovery and liberation of the death camps.

Calling ICE nazis (while still hopefully hyperbole) is not necessarily an unfounded comparison.