A plain leaflet compared to one that reminds the reader of goals

Remind readers of your long-term goal.
Give the reader the new information you have - about plans for a meeting, the filing of a grievance, or whatever - but work in references to how this new development fits into the drive for a larger goal.
A leaflet on voting in a representation election should remind workers that the overall goal is to build a strong local union to fight more effectively for improvements on the job.
A grievance may be the focus of a leaflet, but remind readers that the long-term solution may be better language in the contract.

Avoid jargon or details most people don't care about.
If you are active in the day-to-day battles you may forget that other people don't know as much about the situation as you do. The numbers of the contract clauses or of proposed bills before the legislature or the technical words that have become second nature to you, may be foreign to others. The leaflet should highlight the principles involved and the way the outcome will affect the reader. If you feel that the reader needs to know some of the jargon, be sure to explain it fully.

A leaflet using jargon compared to one that makes its point