It will be very hard to pin the problems with Chicago on Republicans.
In fact, I would go so far as to say that a lack of political opposition in any circumstance, regardless of the party itself, will lead to anti-democratic behavior.
The real issue is that police overwhelmingly enjoy an uncritical view by the voting public such that no politician can afford not to support them. What needs to disappear is the misplaced support for police among the public.
From 1977 to 2003 Republicans were in control of Illinois executive office. 26 years in a row.
From 1972 to 1991, Jon Burge running the show as Chicago police commander.
Are you trying to say that Republican governors had no power to investigate/curtail the evil that was brewing under his leadership?
hehe.