ANDRE PAULTRE and SARAH MARSH THE widow of slain Haitian President Jovenel Moise has accused shadowy enemies of organizing his assassination to stop democratic change, as a struggle for power intensified in the Caribbean country. Moise was gunned down before dawn at his Port-au-Prince home by what Haitian authorities said was a unit of trained assassins comprised of 26 Colombians and two Haitian Americans. Doubts have grown, though, about that narrative, with families of at least two of the Colombians saying they had been hired as bodyguards. Martine Moise, who was wounded in the attack on the president's private residence…