Amaram stole the Shardblade, killed Kaladin's squad to continue to keep the magic formula from getting out, and sold him into slavery as a deserter. Shardblades are priceless magical swords, and Kaladin lawfully gained that Shardblade, but Amaram made a decision that a Shardblade would be wasted on a peasant with no training and need to go to a noble like him who would conserve the planet.