Employee Classification

Is there anyone with expertise / experience with employee classification (i.e., W-2 vs. 1099)? I am looking at a company and not convinced they are classifying their 1099 contractors correctly and would like to determine whether there are actions I could take as the owner so that they remain 1099 or confirm that they should be converted to W-2 employees. Please DM me if you have any input and I can fill you in on the details. Thanks!