E1b1b1 haplogroup is second most prevalent haplogroup among the Jewish population
Y-chromosomal Aaron
Y-chromosomal Levi (para)
The E1b1b1 haplogroup (formerly known as E3b1) has been observed in all Jewish groups worldwide. It is considered to be the second most prevalent haplogroup among the Jewish population outside of the J haplogroups. According to one non-peer reviewed paper[46] it has also been observed in moderate numbers among individuals from Ashkenazi, Sephardic and Samaritan communities having traditions of descending from the tribe of Levi, suggesting that the E1b1b1 men claiming to be Levites may have existed in Israel before the Diaspora of 70 C.E.
http://en.wikipedia.org/wiki/Y-chromosomal_Aaron