Which is correct?
We have received expressions of concern about wiretap Trojans from various _________ the Electronic Privacy Information Center (EPIC) and the Privacy Coalition.
a. groups, including
b. groups including
Use a comma before including if the sentence would be complete without the part that follows. (The same rule applies to such as.)
Dan Santow explains this in more detail in his Word Wise blog.
Claire Caterer writes about using commas for greater effect in her blog, The LetterPress.