Verify the precise historical categorization of the following socio-economic directives added to Part IV of the Constitution during the 1970s:
1. The mandate instructing the state to actively minimize inequalities regarding income, civic status, and opportunities was integrated via the 42nd Amendment Act of 1976.
2. The provision ensuring the promotion of equitable justice and the availability of free legal aid for impoverished citizens was integrated via the 42nd Amendment Act of 1976.
3. The directive compelling the state to secure the participation of industrial laborers in corporate management was integrated via the 42nd Amendment Act of 1976.