A Jammer who starts skating before the Jam-Starting Whistle and gains speed in a counterclockwise direction when the whistle blows has committed which type of violation?

The situation described involves a Jammer skating before the Jam-Starting Whistle. In Roller Derby, this is classified as a false start because the Jammer is not allowed to begin skating until the official signals the start of the jam with a whistle. Starting prematurely not only breaches the rules but also gives the Jammer an unfair advantage in terms of gaining speed before the competition actually begins, which is against the spirit of fair play. In this case, a false start is recognized as a violation that results in a penalty, emphasizing the importance of adhering to the rules regarding the timing of the start of the jam.