What is the difference between labour class ppl and servant class ppl?..plzz help me.itz very confusing...?

i have got an economic homework where i need to compare business class ppl, labor class ppl and servant class...i kwn very well abt d business class and can write abt it...but wat iz dis heck abt labor and servant....wat iz a rickshaw puller..a servant or a labor...and wat abt a cycle repairing shop(not exactly a shop, i mean a tiny slum wid an air pumb and few cycle oil)...and wat r d garbage lifter...and wat abt d masons...plz help me..m in a dilemma..!!