Can other people get your tax return info?

Not without your signed authorization for that purpose.

The below information comes from is available at the IRS gov web site.

Use the search box for Publication 1 or you can click on the below related link.

The IRS will not disclose to anyone the information you give us, except as authorized by law. You have the right to know why we are asking you for information, how we will use it, and what happens if you do not provide requested information.