This is the group of Jews to which Judah Maccabee belonged to.. From the 'Book of Maccabees' which is not a part of our Tanach, yet it is still considered historical...
http://www.shechem.org/torah/macabim/2.html"Those of the Jews who are called Hasideans, whose leader is Judas Maccabeus, are keeping up war and stirring up sedition, and will not let the kingdom attain tranquillity.[7] Therefore I have laid aside my ancestral glory -- I mean the high priesthood -- and have now come here,
[8] first because I am genuinely concerned for the interests of the king, and second because I have regard also for my fellow citizens. For through the folly of those whom I have mentioned our whole nation is now in no small misfortune.
[9] Since you are acquainted, O king, with the details of this matter, deign to take thought for our country and our hard-pressed nation with the gracious kindness which you show to all.
[10] For as long as Judas lives, it is impossible for the government to find peace."
[40] And each said to his neighbor: "If we all do as our brethren have done and refuse to fight with the Gentiles for our lives and for our ordinances, they will quickly destroy us from the earth."
[41] So they made this decision that day: "Let us fight against every man who comes to attack us on the sabbath day; let us not all die as our brethren died in their hiding places."
[42]
Then there united with them a company of Hasideans, mighty warriors of Israel, every one who offered himself willingly for the law.[43] And all who became fugitives to escape their troubles joined them and reinforced them.
[44] They organized an army, and struck down sinners in their anger and lawless men in their wrath; the survivors fled to the Gentiles for safety.