In Empire Strikes Back, when Yoda tells Luke that he must "unlearn what he has learned," he is talking about resocializing him. This means un-learning the old ways he was taught and instead learning a new way of thinking and acting. Alcoholics Anonymous or weight watchers are good examples of groups that help resocialize individuals. Another way individuals are transformed by resocializing is through total institutions, such as a monastery, a prison or bootcamp.
Bootcamp must be especially powerful because, on a basic level, individuals are learning to not run or hide when being shot at and they are learning to shoot at others. Here is a video showing bootcamp and how recruits are re-socialized into Marines.
Another example of this from my own life is training in aikido. The image at the right is my dojo from Japan (I am in the back left...with hair :-) Aikido is a martial art that means the way of harmony of energy. It is a different concept of martial arts. It is not fighting, it is not even competitive. It is not, however, like Tai Chi. Aikido is practical and applicable to the world. But it requires training and a new way of thinking about the world, a resocialization.
Here is a link to a story about aikido in action (non-physically).
Here Steven Seagal talks about how he got started in aikido. What really strikes me is that Seagal seems so tough but he says that he had to learn discipline, respect, gentleness and kindness. And he says, "The martial arts taught me to be more understanding and the ability to harmonize with others...we don't want to hurt them." That seems so opposite of what Americans think masculinity is.
Here is a video of physical aikido: