As a thug, you gain the following benefits:

Brute Fighting. You can use either Strength or Dexterity when calculating the DC of your cunning tricks and your rogue tactics.
Executioner. You can use you sneak attack special attack with any weapon (instead of only ranged and finesse weapons).
Thug Tactics. You have advantage on an attack roll against a creature if at least one of your allies is within 5 feet of the creature and the ally isn't incapacitated.