"Destroy the smuggled cargo stacks" is an objective during the mission On Johnson's Trail during Sequence 6
Optional Objective[edit]
Limit firearms use - 0/6
Walkthrough[edit]
Connor needs to move toward clearing out out the Templar Influences in the area. You will be directed to 3 Tax Collectors and 2 Smugglers. Find and kill them all. It only takes a little while to do this.
Tax Collectors[edit]
The Tax Collectors are a group of Soldiers. Track down the ones that are marked on your map and deal with them. There are a total of 3 groups you need to deal with to complete this part of the objective
Smugglers[edit]
Smugglers are individuals that you need to track using your mini-map. They move around a lot more so plan an intercept for when you want to kill them. You can also just bump into them and make them drop the box they are carrying.