Final answer:
Pressure from labor rights organizations on companies in the global garment supply chain is not due to voluntary contributions to the Rana Plaza Trust Fund, but due to ongoing issues with labor practices and unsafe working conditions in outsourced factories.
Step-by-step explanation:
After the tragedy of the Rana Plaza collapse in Bangladesh, which highlighted the severe working conditions in the global garment supply chain, organizations like the Workers Rights Consortium and the International Labor Organization are increasing pressure on companies for a number of reasons. However, such actions are not being pressured for reasons like companies voluntarily contributing to the Rana Plaza Trust Fund; this is demonstrated by the fact that while some companies like Walmart and The Children's Place made sizeable donations, others chose not to contribute at all.
Instead, pressure is being applied due to ongoing concerns about labor practices, as seen with Walmart's legal issues regarding worker penalization, and the fact that many companies continue to outsource production in ways that may lead to unsafe working conditions and unfair labor practices, such as sweatshops.