Sons of Belial in 1 Kings 21-10 In 1 Kings 21-10 (KJB) you can read 


  And set two men, sons of Belial, before him, to bear witness against him, saying, Thou didst blaspheme God and the king. And then carry him out, and stone him, that he may die.


I've seen many translations that use "wicked men" or similar phrases, but there are many other translations that use "sons of Belial" too.

Who were these men? Do we know of some kind of priest that was under the allegiance of Belial in the times of Ahab and Jezebel? 

There are two other occurrences of this phrase:

Deuteronomy 13:13


  Certain men, the children of Belial, are gone out from among you, and have withdrawn the inhabitants of their city, saying, Let us go and serve other gods, which ye have not known;


and

Judges 19:22


  Now as they were making their hearts merry, behold, the men of the city, certain sons of Belial, beset the house round about, and beat at the door, and spake to the master of the house, the old man, saying, Bring forth the man that came into thine house, that we may know him.


Thanks for your responses and God bless you.
I found an article that explains the meaning of the name Belial and the use of the expression "sons of Belial" in the Old Testament.


  Belial is a compound word, believed to have been taken from the Hebrew beliy, meaning “not,” and ya'al, meaning “profit” or “benefit.” It is used twenty-six times in the Old Testament, usually translated as “worthless” in the New American Standard Bible, but also as “base,” “destruction,” “rascally,” and “wicked.” In the earlier books of the Old Testament, when describing a wicked person, the King James sometimes uses “son of Belial” (or “daughter,” “man,” or “people” of Belial). Like many other uses of the term son of, the expression “son of Belial” doesn’t imply that Belial is a real person who fathers children; rather, it’s a description of people characterized by worthlessness or corruption.


The article goes on to explore the name as used in Jewish literature and, more recently, the suggestion Belial is a demon.  The article concludes:


  In Scripture, Belial was used to personify wickedness and worthlessness. The only time the word is used to identify a person is 2 Corinthians 6:15, where the name is applied to Satan. There is no indication from Scripture that Belial is the proper name of a specific demon.  Source: https://www.gotquestions.org/who-Belial.html


I hope this information is helpful to you.