Majlis-e-Ahrar-ul-Islam is a group of people who live in Pakistan and believe in Islam. They want to make sure that the government follows the rules of Islam when making laws and decisions. They also want to make sure that Muslims are treated fairly in Pakistan.
Think of it like this - imagine playing a game with your friends and the person who is in charge of the game is making up rules that aren't fair for everyone. You and your friends would want to speak up and make sure that there are fair rules for everyone to follow. That's what the Majlis-e-Ahrar-ul-Islam is doing for Muslims in Pakistan.
They started a long time ago, back in the 1930s, when Pakistan wasn't even a country yet! They believe that it's important for Muslims to speak up against injustice and make sure that everyone is treated fairly.
So, in short, the Majlis-e-Ahrar-ul-Islam is a group of people who are working to make sure that Muslims in Pakistan are treated fairly and that the government follows the rules of Islam.