Recycling used to come with a lot of rules and restrictions making it somewhat inconvenient, although still worthwhile. Along with other mandated "Recycling Do's", labels used to have to be removed from cans, bottles, and jars. Today's more sophisticated recycling processes for plastic aluminum, and metal are designed to be effective, with or without labels.
It was once necessary to remove paper labels before the recycling process since they can cause flash fires in the furnace when recycling, posing a hazard to employees. It also produces impurities in the end product. Some recycling centers offer to remove the labels at the recycling plant, but this service is more rare and most times not necessary.