Laura was the Human name of a Borg drone who was assimilated at Wolf 359. She was a friend of Seven of Nine via Unimatrix Zero during her Borg regeneration cycles. Laura had a recessive gene mutation that allowed her to experience individuality in Unimatrix Zero while regenerating. She participated in a plan where she and the rest of the drones in Unimatrix Zero would retain their memories and individuality while awake as drones. She was a part of the Borg resistance movement against the collective. (VOY: "Unimatrix Zero")
Laura claimed to have been assimilated at Wolf 359, and while she never stated it specifically, it is safe to assume she was referring to the Battle of Wolf 359 in TNG: "The Best of Both Worlds, Part II". If this is the case, it seems odd that Laura was able to join the collective and live out a life of servitude considering that the Borg cube involved in that battle was destroyed, killing all the drones aboard, and there is no on-screen evidence of any Federationships being assimilated.