Enforcer

In the criminal underbelly of the world not all use their cunning and guile to get by. Some especially dangerous individuals use their overwhelming strength and presence to rule the underworld and keep the law of thieves. Few who have encountered an enforcer live to tell the tale and those that do tend to keep what's left of their mouths shut.

A Delicate Touch

When you choose this archetype at 3rd level you gain proficiency with the Intimidation and Athletics skills if you do not already.

Additionally, choose three simple or martial weapons that lack the Heavy or Two-Handed property. You gain proficiency in them if you don't already have, and these weapons are now able to be used in conjunction with your Sneak Attack feature. 

Shakedown

Starting at 3rd level, you can use the Cunning Action Feature on your turn to attempt to shove a creature.

Cut Through The Fat

At 9th level you know how to stare into a man's heart and freeze his blood. When you make a Deception, Intimidation, or Persuasion check you can force that creature to make against a DC of 8 + your proficiency bonus + your Strength or Dexterity modifier Wisdom saving throw. On a failed save, the creature becomes frightened of you for 1 minute. You can do this once per short or long rest. 

King Hit

At 13th level you've learned to exploit the drop in a mark's guard When you hit a creature with your Sneak Attack feature, that creature must make a Constitution saving throw against a DC of 8+ your proficiency bonus + your Strength or Dexterity modifier. On a failed save, the creature becomes Stunned until the end of their next turn. You can use this feature a number of times equal to your Strength modifier, and regain all uses after a long rest.
(When using this feature, for whichever Modifier you are using for the feature itself either be Dex or Str you only have the amount of uses for each other, basically don't say that you use all the uses of one version of the feature and go to the other to use those uses of the feature like switching for the Dex Variation to Str USE THE ONE YOU WANT TO USE)

Ice 'Em

At 17th level the work might be dirty but you always finish the job. When attacking a creature that is either prone, stunned or frightened your Sneak Attack damage against that creature increases by 4d6