You're correct, there's no mention of crackback blocking in the rule book, but is a term often used in describing a block by a receiver on a linebacker. The only illegal blocks are below the waist, in the back, or in the back and below the waist (clipping). It's your responsibilty to watch that "crackback" to make sure it is a legal block. Coaches always seem to want a clip or BIB when their linebacker gets blindsided by a receiver, but getting blindsided doesn't necessarily mean that the block was illegal. Good luck, and keep asking questions.
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