A group of lawyers and judges led by a rabbi gathered at a synagogue Sunday to say the state of Georgia should exonerate a Jewish businessman who was lynched 100 years ago for a murder they believe he didn’t commit—and for which they believe he was convicted out of fear of an anti-Semitic mob.

They gathered at Temple Kol Emeth in Marietta, a few miles away from the tree on which Leo Frank died 100 years ago Monday. Prayers were said for the souls of Frank and Mary Phagan, the 13-year-old girl he was accused of killing. The audience of about 400 was asked to sign a petition for Frank’s exoneration.