This kind of environment is often a result of the frustration that the workesrs experience when they are overworked, overstretched, understaffed and underpaid. You also see it when a unit manager promotes a culture of blame, and encourages back-stabbing. It may be a hard system for you to penetrate if the management style of the unit is the basis for such unfriendly atmosphere. I would suggest addressing the issue with the unit manager in writing first, then in person if he or she wants to meet with you. In both the letter and the meeting you would politely suggest a change in style from a culture of blame, warlike environment, to a culture of "positive reinforcement", reward oriented environment. You would support your position by showing how patient care would be inhenced when the whole unite operates in harmony, as a team. Good Luck!