Question: Longest and most expensive trial in us history?

context: The McMartin preschool trial was a day care sexual abuse case in the 1980s, prosecuted by the Los Angeles District Attorney Ira Reiner. Members of the McMartin family, who operated a preschool in Manhattan Beach, California, were charged with numerous acts of sexual abuse of children in their care. Accusations were made in 1983. Arrests and the pretrial investigation ran from 1984 to 1987, and the trial ran from 1987 to 1990. After six years of criminal trials, no convictions were obtained, and all charges were dropped in 1990. When the trial ended in 1990, it had been the longest and most expensive criminal trial in American history. The case was part of day-care sex-abuse hysteria, a moral panic over alleged Satanic ritual abuse in the 1980s and early 1990s.
question: Longest and most expensive trial in us history when the trial ended in 1990?
short_answers: McMartin preschool trial
context: The Annie Larsen affair was a gun-running plot in the United States during World War I. The plot, involving India's Ghadar Party, the Irish Republican Brotherhood and the German Foreign office, was a part of the larger so-called "Hindu–German Conspiracy", and it was the prime offence cited in the 1917 Hindu–German Conspiracy Trial, described at the time as the longest and most expensive trial in American legal history.
question: Longest and most expensive trial in us history when it took place in 1917?
short_answers: Hindu–German Conspiracy Trial

Answer: The McMartin preschool trial was a day care sexual abuse case in the 1980s, prosecuted by the Los Angeles District Attorney Ira Reiner. After six years of criminal trials, no convictions were obtained, and all charges were dropped in 1990. When the trial ended in 1990, it had been the longest and most expensive criminal trial in American history. The Annie Larsen affair was a gun-running plot in the United States during World War I. The plot, involving India's Ghadar Party, the Irish Republican Brotherhood and the German Foreign office, was a part of the larger so-called "Hindu–German Conspiracy", and it was the prime offence cited in the 1917 Hindu–German Conspiracy Trial, described at the time as the longest and most expensive trial in American legal history.