European and other colonial slavers branded millions of (mainly African) slaves. Sometimes there were several brandings, e.g. for the monarch and then for consecutive private owners, as well as by the slave catchers.
A slave is someone who is considered to be mere livestock, a biological entity owned and sold for arbitrary use and abuse as a work unit, or as a toy.
Branding has also been used as a punishment for convicted criminals (or escaped slaves), combining painful physical punishment with public humiliation (its important that the brand is visible)
When my nan was alive it was automatic for her to cut off any labels that were on the outside of her clothes. She believed that advertising belonged on billboards.