These are European paper wasps.
(They look very similar to yellowjacket wasps but you can notice the antennae; they are brown here whereas they are black in case of yellowjackets. There are other subtle differences too.)
See this post on Gardening & Landscaping stackexchange about getting rid of wasps.
(This part is probably not really on-topic here ...
Based on the head morphology and the upper limb visible on the first picture, I would say it looks like a mantis. The length of the abdomen also confirms the same.
The internet is also full of several non-scientific sources that seem to confirm they eat aphids. Animals will normally learn to avoid bitterness in food as it's a sign of toxicity. I haven't ...
According to the pest control expert, the ants are likely pharaoh ants. It matches the description on the Wikipedia page in all respects:
Pervasiveness in indoor environments throughout the world
He is treating the problem in my unit and a neighbour's unit using Maxforce Quantum. It could take some time :( .
This is not conducive to a ...
Stay vigilant. As you've noticed, once wasps get established in an area, they'll reproduce and spread out. Continue to watch for and eradicate nests. Hardware stores will sell a variety of chemical sprays, but a mix of liquid soap (dish detergent) and water works just as well.
Use wasp traps to prevent wasps from establishing new nests in your area. You ...