I am interested in finding out what these bugs are, they are everywhere in the garden, grouping. Are they harmful? Should we get rid of them?

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You don't say where you are and the picture is a bit grainy but I'd say it is a true bug (ie order Hemiptera) and  - if you are in N america - I'd hazard a guess at teh box elder bug. If so the one in the photo is a nymph rather than an adult (which is also red and black but rather different patterning). IF I am right, they are not harmful to you and while they may do some damage to your plants they are not considered serious pests.