If you read the last part of the explanation general strikes are official strikes of one union to support another, so general strikes are acceptable as long as it’s not an official strike and can be organized by a union or group of people.
The act made it illegal for one union to go on strike to support another. Hence, the definition and practice of a general strike changed in modern times to mean periodic days of mass action coordinated, often, by unions, but not an official or prolonged strike
If you read the last part of the explanation general strikes are official strikes of one union to support another, so general strikes are acceptable as long as it’s not an official strike and can be organized by a union or group of people.