What law set minimum time frames for both union local and national secret ballot elections $($i$.$e$.,3$ and $5$ years$)?$

The National Labor Relations Act, $1935($The Wagner Act$)$

The Employee Free Choice Act Bill

The Railway Labor Act, $1926$

The Labor Management Reporting and Disclosure Act, $1959($The Landrum$-$Griffin Act$)$

The Labor Management Relations Act, $1947($The Taft$-$Hartley Act$)$