After having the decisive vote on issues regarding the Guantanamo Bay inmates, the death penalty for child rape and campaign-finance rules during the past three weeks, Justice Anthony Kennedy did it again and showed who’s in charge when the U.S. Supreme Court is ruling.

Yesterday, on the final day of the U.S. Supreme Court’s term, Kennedy provided once again the decisive vote as the Court ruled with a 5-4 vote that the Constitution's Second Amendment protects an individual's right to own a gun. The 71-year-old who could easily be nicknamed Anthony “Decisive Vote” Kennedy was the only one in majority in al four of the above mentioned cases.

A.E. Dick Howard, a constitutional law professor at the University of Virginia in Charlottesville, said that it’s pretty obvious that Kennedy is “critical” when the Supreme Court votes, Bloomberg reported.

The Supreme Court 5-4 ruling strikes down the gun ban imposed by the District of Columbia and will most likely lead to more controversy over weapons restrictions in Chicago, New York City and other cities more susceptible to legal challenges on this issue.

Jennifer Hoyle, spokeswoman for the Chicago's law department said the Court’s ruling gives people "an opening to challenge the ordinance in a way it hasn't been challenged in many years,” The Washington Post reported. Hoyle added that the ruling according to which U.S. citizens have the right to keep guns at home for self-defense does not invalidate Chicago's law.

The National Rifle Association along with other guns rights advocates already filed suit.

"Our founding fathers wrote and intended the Second Amendment to be an individual right. The Supreme Court has now acknowledged it,'' said the NRA in a statement.

The ban was imposed in Washington 32 year ago. It was probably the strictest in the U.S. as it barred most residents from owning handguns and required that all legal firearms be kept unloaded and either disassembled or under trigger lock.