If you are at the forefront of a campaign or other activity, you have a leading and influential position in it. They have been at the forefront of the campaign for political change. If something is at the forefront of people's minds or attention, they think about it a lot because it is particularly important to them.

What does it mean if something is at the forefront?

: in a leading position Their company is at/in the forefront of research in this area.

Which is correct in the forefront of or at the forefront of?

From Longman Dictionary of Contemporary Englishbe at/in/to the forefront (of something)be at/in/to the forefront (of something)to be in a leading position in an important activity that is trying to achieve something or develop new ideas The company has always been at the forefront of science and technology.