Thank you. True, in U.S. English, and when you are referring to the group as a whole, which means you're more likely to hear 'is'. But Australian English (we use British English) prefers to consider the individual members rather than the group as a whole, so we use class are, group are, bunch are, audience are, Samsung are, the U.S. are. As I teach E.S.L. to students from Asia whom have learnt U.S. English and wish to study here, or do some labour, the amount of differences can drive them to drink! :)