The whole idea behind “calling someone out,” is that you name the person. This is especially important when dealing with frauds, liars, hucksters, and entryists.
You have to name them. You don’t use euphemisms or very vague references just so you can claim the moral high ground later on.
[Disclosure: I’ve done both in the past year or two, naming names, and using the vague references because I was afraid of blowback (which never actually happened)]
Anything less is a cop-out.