Baseball and law have intersected since the primordial days. In 1791, a Pittsfield, Massachusetts, ordinance prohibited ball playing near the town's meeting house. Ball games on Sundays were barred by a Pennsylvania statute in 1794.

In 2015, a federal court held that baseball's exemption from antitrust laws applied to franchise relocations. Another court overturned the conviction of Barry Bonds for obstruction of justice. A third denied a request by rooftop entrepreneurs to enjoin the construction of a massive video screen at Wrigley Field.

This exhaustive chronology traces the effects the law has had on the national pastime, both pro and con, on and off the field, from the use of copyright to protect not only equipment but also "Take Me Out to the Ball Game" to frequent litigation between players and owners over contracts and the reserve clause. The stories of lawyers like Kenesaw Mountain Landis and Branch Rickey are entertainingly instructive.