Answer
Yes, they advise on rules and legislation and file briefs with the courts
Explanation
A lobby is is a form of advocacy which has an intention of influencing decisions made by the government by individuals or the lobby groups. A lobbyist is someone who is hired to persuade legislators to support a business or cause. Their main purpose is to win favor from politicians They are normally activists who seek to persuade members of the government to enact legislation that would benefit their group.