Dozens of people opposed to the early release of a man convicted of a 1999 ‘‘thrill killing’’ have rallied in Cranston. The protest Saturday came the weekend before the Rhode Island Parole Board planned to revisit the case of Alfred Brissette Jr. on Monday. Brissette was convicted of killing Jeanette Descoteaux in 1999 after he and another man lured her to a Burrillville forest. Brissette was supposed to be in prison until 2034, but the board voted to release him for good behavior. Officials then reversed the decision and said they would reconsider the case. WPRI reported that the protesters said Saturday they want to be sure the parole board knows Brissette is not a candidate for release at all. They also asked the state General Assembly to increase oversight of parole board decisions.