A utilitarian might reason that forcing one individual to give up some utility so that another can gain more utility is a good thing.
For example, forcing a well-fed person to give a loaf bread to a hungry person might be a good thing because the value (or utility) the hungry person gains is greater that the utility the well-fed person loses. Of course the pragmatic will point out that while this gives a static utility gain, applying this a rule sets a precedent (any hungry person can take food from someone not hungry) which will remove incentive (no point in making bread, I'll take someone else's as soon as I get hungry), and therefore lower total utility (no-one bothers making bread).
This is where communism fails.
On the other hand many utilitarians see this long-term cost, and subscribe to long term solutions.
See