Angelina Jolie's body guards arrested ??

It is right they had no business to hurt innocent parents.

Police and local authorities must have taken action for the following reasons: 1. To gain money from film producer 2. To please one particular community for election gains I do not think the body guards would have crossed their limits. Some mischievous people from one community wanted to create some trouble to gain in troubled waters. In future any filmmaker should ensure they should not involve such over sensitive people.

What did they do to get arrested?

what did he/she do. Just because you are portecting someone doesn't give you the right to break any laws...can't really answer if don't know what he/she did