State Electric, a nonunion contractor, is doing the electrical work at the construction site of a church.

The employees of a number of other contractors are also working at the construction site. The Electricians’ Union begins picketing the construction site, but pickets at all gates into the site even though State Electric employees are restricted to Gate 1.

When the union begins picketing, the employees of the other contractors at the site refuse to work. Has the union violated Section 8(b)(4)?

Explain. What, if any, actions should the union take to make sure the picketing is legal? Why?