Employees Rights in an Emergency?

Waiting-for-Ivan asks: "In Florida in the past month and a half, we have survived 2 hurricanes. During the last one I was within the areas with a hurricane warning (i.e. hurricane conditions are expected within 24 hours). My company (who will remain unnamed) wanted everyone to come in. Those who did not come in had their pay docked (salary or hourly didn't matter) and threatened with loss of their pay for Labor Day. We are not an emergency facility whose services are required during an emergency. Is this legal? Can they make us come in during a hurricane warning (or any other environmental emergency) and if we refuse can they punish us for not doing so? Do we as employees have any rights (and can they dock salaried employees so easily)? What laws are in affect explaining these circumstances?