Numerous San Francisco Giants pitchers faced criticism after inscribing Bible verses on their caps during the team's annual Pride Night on Friday. Now, MLB is cracking down on the practice, warning those players they could face "future violations" for writing on their uniforms.

Major League Baseball has warned players about writing on their uniforms after San Francisco Giants starter Landen Roupp and two other pitchers added Bible verses to their Pride Night caps last week.

“That’s just kind of something I believe in, and I stand firm in that, and I’m thankful we live in a country where, you know, we have the freedom to believe what we want … and express what we want,” R...