Federal laws outlaw a variety of actions that are not always communicated to new immigrants. If you are uncertain about your situation or worried you may have done something wrong, call an immigration lawyer as soon as possible to get things sorted out.
The consequences of breaking immigration law include fines, removal from the country, and potential bans on re-entry. While legally entering the U.S. is already a long and expensive process, it becomes much more difficult if you ignore rules or do something illegal.