By Lucy Skoulding A former president of the Hells Angels has opened up about deciding to leave the biker group after 40 years, saying he was immediately excommunicated by the men he once called brothers. George Christie said leaving the notorious club was a “difficult decision” but that he doesn’t “miss going to prison”. The 77-year-old resigned from the club in 2011, leaving behind his presidency of the Ventura chapter. He said he had become disillusioned by the group, which had gone from being a brotherhood when he first joined to an all-out war. By the time he was getting ready to leave, he…