Let X be a connected topological spaces with finite rational Betti numbers. We denote by G the radical of its fundamental group and by (∧V,d) its minimal Sullivan model. If dim Vi<∞ for each i≥2 , then the dimension of the rationalization of G is less than or equal to the Lusternik-Schnirelmann category of X.
Félix, Y., & Halperin, S. (2017). Malcev completions, LS category, and depth. Boletín de la Sociedad Matemática Mexicana, 23(1), 267-288. https://doi.org/10.1007/s40590-016-0097-7 (Original work published 2016)