The Untouchables
I do like NJC but re- watching it recently I was amazed at all the homages (and, at times, just blatant thieving) from The Untouchables!
And they try to throw you off the scent by continually referencing DePalma's other Crime epic, Scarface!
But seriously, almost every other scene (and same basic plot) is lifted from the 1987 Untouchables!