[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/03/31/art_cat.jpg caption= "Caterpillar's French staff say they are angry about a lack of negotiations over layoffs."] From Producer Beth Rotatori and CNN Wire Caterpillar officials are calling for the release of a group of company executives being held hostage at a plant in Grenoble, France, by hundreds of workers angry about proposed lay-offs. … Continue reading Caterpillar calls for release of execs held hostage in France