Why was it important for trade unions to engage in collective bargaining?

A union fundamentally is an association of individual workers seeking to address common workplace issues. ... The statutory right to form a union and engage in collective bargaining is necessary to ensure that workers can continue to exercise their civil right to associate with other workers on issues of mutual concern.
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Collective Bargaining and Civil Liberties

A union fundamentally is an association of individual workers seeking to address common workplace issues. The statutory right to form a union and engage in collective bargaining is necessary to ensure that workers can continue to exercise their civil right to associate with other workers on issues of mutual concern.