It's standard policy for the league to investigate claims of racism or issues involved in work place environment.
A day after serious accusations of racist and sexist comments were leveled at the Mariners, specifically general manager Jerry Dipoto, manager Scott Servais and director of player development Andy McKay by Mariners’ former director of high performance Dr. Lorena Martin, Major League Baseball confirmed that it will conduct an investigation into her claims.
In any situation where an employee of a team makes an accusation of racism or improper work conditions of that nature, it is standard policy for MLB to investigate the claim.