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From the List of violent spectator incidents in sports wiki page:

On May 15, 1912, Detroit Tigers outfielder Ty Cobb assaulted Claude Lueker, a heckler, in the stands of Hilltop Park in New York during a game against the New York Highlanders. Lueker and Cobb traded insults with each other throughout the first three innings, and the situation climaxed when Lueker called Cobb a “half-nigger.” Cobb then climbed into the stands and attacked the handicapped Lueker, who due to an industrial accident had lost all of one hand and three fingers on his other hand. When onlookers shouted at Cobb to stop because the man had no hands, Cobb reportedly replied, “I don’t care if he has no feet!” The American League suspended him indefinitely, and his teammates, though not fond of Cobb, went on strike to protest the suspension prior to the May 18 game against the Philadelphia A’s. For that one game, Detroit fielded a replacement team made up of college and sandlot ballplayers, plus two Detroit coaches, and lost, 24-2. The strike ended when Cobb urged his teammates to return to the field. Cobb’s suspension lasted for 8 days.^[1]

More choice violent spectator incidents after the jump!

June 4, 1974 – “Ten Cent Beer Night” – In one of the most remarkably ill-conceived promotions in Major League Baseball history, fans at Cleveland Municipal Stadium for a Cleveland Indians vs. Texas Rangers game were served as many beers as they wanted for just 10¢ each. After numerous instances of drunken fans throwing debris or running onto the field — “streaking” in many instances — the situation boiled over in the 9th inning when a fan ran onto the field and snatched Rangers outfielder Jeff Burroughs‘ cap and glove. Burroughs’ teammates charged out to his aid, followed by hundreds of rioting Cleveland fans who poured out onto the field. The game was forfeited to Texas.

July 12, 1979 – Disco Demolition Night – In a promotion conceived by Chicago DJ Steve Dahl, fans got 98¢ admission to a Comiskey Park doubleheader between the Chicago White Sox and Detroit Tigers in exchange for bringing in a disco record to be blown up between games. Before the “demolition”, many fans began throwing their records, as well as fireworks and debris. The between-games explosion tore a large hole into the field and was followed by thousands of spectators pouring in from the stands. Thirty-seven arrests were made and the second game of the doubleheader was forfeited.