Question: Which Florence Reece Song was written during United Mine Workers Strike?

Context articles: 1920 Alabama coal strike
Florence Reece
Which Side Are You On?
United Mine Workers of America Building
Los Angeles Garment Workers strike of 1933
Carbon County Strike
John R. Lawson
Westmoreland County coal strike of 1910–11
West Virginia coal wars
John L. Lewis House

The 1920 Alabama coal strike, or the Alabama miners' strike, was a statewide strike of the United Mine Workers of America against coal mine operators.
 The strike was marked by racial violence, and ended in significant defeat for the union.
Florence Reece (1900–1986) was an American social activist, poet, and folksong writer.
 She is best known for the song ""Which Side Are You On?
"" which she wrote in 1931 during the Harlan County strike.
"Which Side Are You On?"
 is a song written in 1931 by Florence Reece, the wife of Sam Reece, a union organizer for the United Mine Workers in Harlan County, Kentucky.
The United Mine Workers of America Building is an historic building at 900 Fifteenth St. NW in the Downtown neighborhood of Washington, D.C. Built in 1912 as the home of the University Club, a private social club, it was from 1936 to 1999 as the international headquarters of the United Mine Workers.
 Under the leadership of John L. Lewis, the union played a major role in improving working conditions and pay for a large number of mine workers, with Lewis eventually founding the Congress of Industrial Organizations to improve conditions for other types of laborers.
 The building was designated a National Historic Landmark in 2005.
 The upper floors of the building have been converted to residences.
The Los Angeles Garment Workers strike of 1933 is considered to be one of the most influential strikes in Los Angeles after the passing of the New Deal.
 The strike is known for being one of the first strikes where Mexican immigrant workers played a prominent role.
 The garment workers strike occurred in the fall of 1933 in the downtown Garment District in Los Angeles, California.
 Leaders of the strike, including Rose Pesotta and other members of the International Ladies Garment Workers Union (ILGWU), organized the strike to be culturally orientated in order to include Mexican immigrant workers to fight for union recognition in the garment industry.
The Carbon County Strikes took place in Carbon County, Utah from 1903–1904.
 The strikes primarily consisted of Slavic and Italian immigrant mine workers who partnered with the United Mine Workers of America strikes in Colorado to protest the dangerous working conditions of the Utah coal mines.
 The Carbon County strikes were considered the most important labor confrontation in the United States at the time.
 The Utah Fuel Company strongly opposed initiatives to unionize coal workers in Utah and were the primary opposition to the UMWA at the time.
 The Carbon County Strikes would ultimately fail in its attempt to unionize the coal workers of Utah simply because it "did not have enough support, either internally or externally, to win against a powerful and influential company that effectively played on radical, anti-foreign sentiments in defending its position" but it demonstrated a significant nationwide effort in strengthening unionization in the west.
John R. Lawson (died May 12, 1945) was a Colorado union leader and businessman.
 He was the leader of District 15 of the United Mine Workers of America at the time of the Ludlow Massacre which resulted in the death of 20 strikers and supporters, many of them children.
 He was convicted on May 3, 1915 of the murder of a deputy sheriff who died at Ludlow during the massacre at a trial held in Trinidad, Colorado and sentenced to life at hard labor but freed on appeal to the Colorado Supreme Court in June, 1917.
 He served as president of the Colorado Federation of Labor and on the International Executive Board of the United Mine Workers.
 He was a vice-president and director of the Rocky Mountain Fuel Company.
The Westmoreland County coal strike of 1910–1911, or the Westmoreland coal miners' strike, was a strike by coal miners represented by the United Mine Workers of America.
 The strike is also known as the Slovak Strike because about 70 percent of the miners were Slovak immigrants.
 It began in Westmoreland County, Pennsylvania, on March 9, 1910, and ended on July 1, 1911.
 At its height, the strike encompassed 65 mines and 15,000 coal miners.
 Sixteen people were killed during the strike, nearly all of them striking miners or members of their families.
 The strike ended in defeat for the union.
The West Virginia coal wars (1912–21), also known as the mine wars, arose out of a dispute between coal companies and miners.
 The first workers strike, in West Virginia, was the Cabin Creek and Paint Creek strike of 1912-1913.
 With help from Mary "Mother" Jones, an important figure in unionizing the mine workers, the miners demanded better pay, better work conditions, the right to trade where they pleased (ending the practice of forcing miners to buy from company-owned stores), and recognition of the United Mine Workers (UMW).
 The mining companies, however, refused to meet the demands of the workers and instead hired Baldwin-Felts Agents, equipped with high-powered rifles, to guard the mines, but more important to be strikebreakers.
 After the Agents arrived, the miners either moved out or were evicted from the houses they had been renting from the coal companies, moving into coal camps that were being supported by the Union.
 Approximately 35,000 people lived in these coal camps.
 It wasn't until a month after the strike began that it became hostile with the arrival of the Baldwin-Felts Agents who provoked the miners.
 The union began supplying miners with weapons: 6 machine guns, 1,000 high-powered rifles, and 50,000 rounds of ammunition.
The John L. Lewis House is a historic house located at 11332 West Lawrence Avenue in Springfield, Illinois.
 The house was the home of American labor leader John L. Lewis from 1917 to 1965, encompassing the most productive and influential of his adult life.
 Born in 1880, Lewis became a coal miner at the age of 15 and quickly became active in union activities.
 Three years after he moved to his house in Springfield, Lewis became president of the United Mine Workers of America.
 Lewis became a prominent national labor leader in his new role, and he used his position to support union efforts in other industries as well.
 He founded the Congress of Industrial Organizations in 1935, becoming its first president, and helped lead strikes in the steel and automotive industries.
 Lewis retired from his presidency of the United Mine Workers in 1960 and died nine years later.