Trade union funds: general funds restricted to prescribed uses; a separate voluntary fund may finance civic and political activities. Section 15 confines expenditure of a registered trade union's general funds to prescribed objects and provides that member subscriptions shall be prescribed. It permits constitution of a distinct separate fund for promoting members' civic and political interests, funded only by voluntary contributions; contribution cannot be compelled, cannot be a condition of admission, and non-contributors cannot be excluded from benefits or disadvantaged except in control or management of that separate fund.