is it illegal if I went into my job and took my job application back from my employer?

I went into my place of employment before quitting and took my job application. the job was under the table and the application had my social security number. I do mot trust my employer to not use my personal information so I took my application back. it was accessible behind the desk which I was allowed behind in a manilla folder. when i took the application i was assaulted by my employer and then told that i stole property. is what i did illegal?