To dream of anger, denotes that some awful trial awaits you.
This may be a carry-over from your daily life. In our dreams we can experience and express such feelings safely.
Feeling great anger in your dream may be disturbing but pay attention to it and attempt to deal with all of your emotions in a more appropriate and productive manner.
Anger in a dream at someone you know is usually an expression of pent-up hostility toward that person.
In waking you may not be able to express your anger, because you do not wish to hurt their feelings or they may be your employer.
In sleep anger comes out because you have to vent it in some fashion.
If you dream that someone is angry at you, then this means that you either suspect that the person in real life is angry at you, or you have that particular paranoia.