Major Organization Baseball (MLB) is the oldest professional sports league in the United States, with 30 member clubs representing the top level of professional baseball in the United States and Canada. Major League Baseball is North America's most popular sport. All ten of the best-attended individual seasons in MLB history have occurred in the recent decade, with each regular season above the 73 million mark. MLB presently has record levels of labor peace, competitive balance, and industry revenues, as well as the most comprehensive drug-testing regime in American professional sports, thanks to Commissioner Robert D. Manfred, Jr. MLB is devoted to making a positive influence in communities across the United States, Canada, and across the world, sustaining the sport's greater social role and permeating every aspect of the sport's economic, marketing, and community relations efforts.
