What the heck?

So I posted last week about some shady looking guys that have showed up in my neighborhood. They were seen last week looking into my neighbors open garage and hurried off when they were caught staring into it. Well this morning my mother was leaving to go to the doctor and she noticed one of the guys standing by a red truck and when he noticed my mom she said he ducked away behind his truck really quick to hide and when she got around to where she could see him in her mirror he was staring at the car as she left. Well about less than 30 minutes later after my mom called and warned me that this guy was acting weird I looked out the front window and the guy had rode up to the end of the road in the red truck and was slowly moving by the houses. Well, when he was passing the neighbors that he had been staring at last week he almost stopped completely before moving on. Multiple of us in the neighborhood have noticed that when someone leaves that the guy in the red truck will ride up in here and scope out who's left from where and we're getting really worried that they may be criminals intending to do something. Especially because the house that they seem interested in is the only one in here with two young sons and a daughter all under the age of 10 years old. Plus the house that they've taken residence in has an old man living there that none of us have seen for a while now. I was told that nothing could be done about these guys despite the fact that every time someone leaves they've been seen checking the houses.