Can. 1318 A legislator is not to threaten latae sententiae penalties, except perhaps for some outstanding and malicious offences which may be either more grave by reason of scandal or such that they cannot be effectively punished by ferendae sententiae penalties. He is not, however, to constitute censures, especially excommunication, except with the greatest moderation, and only for the more grave offences.
Obviously this doesn't just refer to the Pope, so it's clear that a bishop can constitute censures of even excommunication.
Belonging to "Call to Action" is a "grave offense"?
Only in the mind of Fabian Bruskewitz.
A "grave offense" in Lincoln is not a "grave offense" in Chicago.
So, the grave offense in Lincoln is not a grave offense.