Which of the following did labor organizers believe was necessary in order for industrial workers to gain wage increases:
1. government price controls
2. mandatory union participation
3. the right to bargain collectively
4. minimum wage laws

2 mandatory union participation

Explanation:

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the section of the chart that represents a point at which a bill needs approval from a majority of people in both chambers to advance is j, as this is the only section before the bill becomes law which has both rows (symbolizing the chambers) converging into one, meaning that the two parts of the congress have to approve of it before it can march on with the process.