You're got to be kidding. The post is about right to work laws. It includes a summary of what that means, plus links for more information. So you downvoted because OP didn't compare and contrast two unrelated laws or write a dissertation on how right to work laws vary by state/county/city. Laws that by definition literally only do one thing. This shit is why people don't post more.
To highlight how ridiculous your comment is, I'll help OP out and provide what you found to be so lacking. I know this is going to make OP look pretty bad, so I'm sure they'll provide at least a partial refund of what you paid for their post.
At-will employment: you can be fired for anything not protected by law.
Right to work laws: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues.
Compare: they are applied to employees
Contrast: neither does anything similar
For my next trick, I'll provide specific relevant application for local law scenarios by state.
Alabama: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Arkansas: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Georgia: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Idaho: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Indiana: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Iowa: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Kansas: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Kentucky: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Louisiana: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Michigan: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Mississippi: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Nebraska: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
North Carolina: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
North Dakota: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Oklahoma: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
South Carolina: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
South Dakota: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Tennessee: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Texas: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Utah: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Virginia: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Washington: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
West Virginia: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Wisconsin: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues
Wyoming: employees in unionized workplaces cannot negotiate employment contracts which require that non union employees must pay union dues