A documentary on infamous attorney Roy Cohn will debut on HBO in 2019, drawing on extensive, newly unearthed archival material to present the most revealing examination of him to date. Director Ivy Meeropol ("Indian Point," HBO's "Heir to an Execution"), granddaughter of Julius and Ethel Rosenberg, spent much of her life feeling both repelled and fascinated by the man who prosecuted the Rosenbergs in what became known as the "atomic spies" case, obtaining their convictions in federal court and then insisting on their executions.