Question: What incident at South Hadley High School led to the enactment of stricter anti-bullying legislation by the Massachusetts state legislature?

Context paragraphs:
Julius Caesar Chappelle: Julius Caesar Chappelle (1852–1904) was an African-American politician born into slavery in South Carolina.  After the American Civil War, he lived for a time with his family in LaVilla, Florida, helping develop the new town.  In 1870 he was one of numerous Southern black migrants to Boston, Massachusetts, which had a thriving black community and strong abolitionist history.  He later joined the Republican Party that was founded by abolitionists, and Chappelle was elected to two terms in the Massachusetts state legislature, serving 1883-1886.  Julius Caesar Chappelle was also the first African-American to serve on the Massachusetts State Senate Committee where he served three terms.  Chappelle was active in supporting civil rights, trying to reduce discrimination, and consumer affairs.  His speeches were frequently covered by newspapers.  Throughout his life and political career, he held secondary supervisory government positions in maintenance, such as at the United States Post Office and US Boston Custom House.  Although Julius Caesar Chappelle may have graced the same pages in newspapers as Frederick Douglass, Chappelle is not as well-known because he is not known to have left much of a literary footprint such as writing manuscripts or for pamphlets.

South Hadley Public Schools: South Hadley Public Schools, also known as South Hadley School Department, is a school district in South Hadley, Massachusetts, United States.  The superintendent is Nicholas Young.

J. A. Skinner State Park: Joseph Allen Skinner State Park is a state-owned, public recreation area located in the towns of Hadley and South Hadley in the Connecticut River Valley of western Massachusetts.  The state park surrounds Mount Holyoke, the westernmost peak of the Mount Holyoke Range.  At the summit is the historic Prospect House, an old hotel first opened in 1851.  The park is managed by the Massachusetts Department of Conservation and Recreation.

Mount Holyoke: Mount Holyoke, a traprock mountain, elevation 935 ft , is the western-most peak of the Holyoke Range and part of the 100-mile (160 km) Metacomet Ridge.  The mountain is located in the Connecticut River Valley of western Massachusetts, and is the namesake of nearby Mount Holyoke College.  The mountain is located in the towns of Hadley and South Hadley, Massachusetts.  It is known for its historic summit house, auto road, scenic vistas, and biodiversity.  The mountain is crossed by the 110 mi Metacomet-Monadnock Trail and numerous shorter trails.  Mount Holyoke is the home of J.A. Skinner State Park which is accessible from Route 47 in Hadley, Massachusetts.

Stanley C. Cox: Stanley Cullen Cox (July 2, 1883 - June 7, 1942) was an American physician who was the head of the Medical Division of the Office of Civilian Defense at the time of his death in 1942.  He was born in 1884 in South Hadley, Massachusetts.  He attended Holyoke High School and Williston Academy before enrolling at the University of Michigan.  He received a bachelor's degree from Michigan in 1908 and a medical degree in 1910.  While attending Michigan, he played on the school's first basketball team, the 1908–09 Michigan Wolverines men's basketball team.  After receiving his medical degree from Michigan, Cox was employed at Gouverneur Hospital in New York for two years.  He then returned to Holyoke, Massachusetts, where he went into private practice.  He served as a military surgeon during World War I and became the head of the Medical Division of the Office of Civilian Defense during World War II.  He was married to Almira Fay Leavitt in June 1912.  They had three daughters and two sons.  He died at age 58 in June 1942 from a heart attack while marching in an "On To Victory" parade in Holyoke.

Horace Mann: Horace Mann (May 4, 1796August 2, 1859) was an American educational reformer and Whig politician dedicated to promoting public education.  He served in the Massachusetts State legislature (1827–1837).  In 1848, after public service as Secretary of the Massachusetts State Board of Education, Mann was elected to the United States House of Representatives (1848–1853).  About Mann’s intellectual progressivism, the historian Ellwood P. Cubberley said:

Suicide of Phoebe Prince: The suicide of Phoebe Prince, on January 14, 2010, led to the criminal prosecution of six teenagers for charges including civil rights violations, as well as to the enactment of stricter anti-bullying legislation by the Massachusetts state legislature.

South Hadley High School: South Hadley High School is a secondary school in South Hadley, Massachusetts for students in grades 9–12.  The school has a student population of just over 700.  The school's name is frequently referred to as "SHHS".  In January 2010, the school became known across the United States and internationally for a series of bullying incidents that led to the suicide of Phoebe Prince.

John F. Dolan: John F. Dolan (1922–2013) was a longtime member of the Massachusetts State Legislature and an advocate of conservation.  During his tenure in office as a State Representative, Dolan helped create groundbreaking legislation for the conservation of natural resources in the State of Massachusetts.

Benjamin Ruggles Woodbridge: Benjamin Ruggles Woodbridge (March 5, 1739March 8, 1819) of South Hadley, Massachusetts, practiced medicine and law, was a colonel in the Massachusetts militia during the American Revolutionary War, and was a commander at the Battle of Bunker Hill.  He was also a farmer, and he owned a rum still, a wood lot, a grazing meadow, and a mill, and came to be the wealthiest man in the town.  Colonel Woodbridge was a member of the Massachusetts legislature for many years.  Woodbridge was unmarried, and raised his nephew Theodore Strong, as his own son.  Benjamin Ruggles Woodbridge died in 1819 at the age of 80.  He is sometimes referred to as Ruggles Woodbridge or Benjamin Woodbridge.

Supporting paragraphs: South Hadley High School Suicide of Phoebe Prince
Answer: The suicide of Phoebe Prince