Final answer:
True, the three-line violation is generally not called if a goalkeeper throws the ball, as it is meant to enable quick counters and discourage long-ball tactics in indoor soccer or futsal.
Step-by-step explanation:
The statement, "The three-line violation shall not be called if thrown by the keeper," is true. In soccer, this rule applies to indoor soccer games or futsal, where the three-line violation is in effect. This rule prevents a team from launching the ball from their own defensive third of the pitch across the other two-thirds to the attacking third without it touching another player, the ground, or the goal itself. However, the goalkeeper is typically exempt from this violation when throwing the ball. This is to allow keepers to start quick counterattacks without being unfairly penalized. The aim of the rule is to encourage short passes and possession-based play rather than long-ball tactics.