Just saw this. In 1947, the Cardinals voted to strike rather than integrate:
https://news1.newstoday123.com/tienchung8386/the-secret-meeting-that-almost-destroyed-baseball-forever/?fbclid=IwY2xjawSVJ55leHRuA2FlbQIxMABicmlkETFiSUpqellpTDg3WnE3eEZVc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHpIeej9JEMBhb-QIsX5e1-9IU5AGn7xRGnVvAtOP-rPLJnAOQ68rOXcY6xC-_aem_RMX8GdQGkJq0UDP3ASmAPg
Later