Think of a business; perhaps one you used to work for. Go to their subreddit and make a topic about unions. Bring up the fact that it's federally illegal to punish/fire you for unionizing or just talking about unionizing. Talk about how even if it's company policy to not talk about unionizing, it's still illegal. Discuss strategies to prevent retaliation. Discuss what to do in case of retaliation or imminent retaliation. People everywhere are still woefully uninformed about their right. This is an opportunity to accelerate the movement.