Fathers 4 Justice is a group of grown-ups who want to make things better for dads and their kids. Sometimes, when parents break up, dads don't get to see their kids as much as they want to. This makes dads and kids feel really sad.
Fathers 4 Justice wants to change this. They wear superhero clothes and do things like climb tall buildings to get people's attention so that they can talk about their feelings. They want people to know that dads are important and they should be able to spend time with their kids.
It's kind of like when you want to play with your favorite toy, but someone else won't let you. You feel really upset and just want to play with it. Dads feel the same way about seeing their kids. Fathers 4 Justice is just trying to help make it okay for everyone to share the toy, or in this case, have time with their kids.