Sketchy security dudes at Hobby airport parking

Just came to Hobby to pick up a relative at baggage claim. Was going to park in the red garage, but before I entered, two sketchy-looking security people in a golf cart stopped my car. They wouldn't let me pull into the garage until I told them my name and what flight I was meeting. WTF?

Anybody seen this happen before? What possible purpose would this serve, apart from a blatant invasion of privacy?