In 2005, a labor conflict between the United States Soccer Federation and its players led to United States men's national soccer team players not reporting to camp in advance of qualification for the 2006 World Cup.
The Arena Football League Players Union voted to go on strike on March 9, 2012, the same day as they were scheduled to begin the 2012 season.
However, the strike only lasted for six hours and only affected the season opener between the Pittsburgh Power and Orlando Predators.
During the 2020–21 UEFA Nations League B while preparing for 2 away matches against Romania and Austria, the Norway member Omar Elabdellaoui tested positive for COVID-19 on 13 November 2020.
[5] Under Norwegian government rules at the time, this meant the entire squad he had been practicing with were banned from travelling to other countries while in quarantine.
They missed out on a win that would've seen them promoted to the 2022–23 UEFA Nations League A, but were nevertheless applauded for their effort back in Norway.
In June 2012, the NFL Referees Association's collective bargaining agreement expired, resulting in the original officials being locked out.
The NFL refused to overturn the erroneous call but intensified their efforts to reach a deal with the union.
At the 1969 NASCAR Talladega 500, many of the top drivers in the Grand National Series boycotted the race, due to safety issues.
The drivers who were part of the newly formed PDA (Professional Driver Association) led by Richard Petty, cited dangerous high speeds, coupled with tire grip/wear issues at the brand new Alabama International Motor Speedway.
NASCAR scrambled to fill the field last-minute with other drivers not affiliated with the PDA, and drivers from the Grand American series ("pony cars") to run a race for the fans, most notably Richard Childress, who later won eleven NASCAR national titles as an owner.
The field included such unknown drivers as Racin Gardner (land speed records), Brad Murphey (who was also a former bronco riding champion), Joe Gosek (supermodifieds), as well as Johnny Parsons and Danny Ongais; both of whom had not driven in the race since 1986.