::::The article already makes it clear, in the first sentence, that the men's rights movement is a part of the men's movement. There are already many articles dealing with men's rights as a general topic. In addition to men's movement, Masculism and Men's studies seem especially relevant. This article (the men's rights movement article) is very specifically about the movement-within-a-movement as it has been described by reliable sources. If you want to expand the article, find reliable sources, but be cautious that you may be reinventing the wheel, and other articles might be closer to what you're looking for.