Close your wallets for any national collection.
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What Advoluntas said. Parish collections only and even then, keep a close watch because unless I'm mistaken parishes do have to contribute to the diocese. It's better to (anonymously) donate to specific parish projects (i.e. paying for the materials/ labor of construction/ plumbing/ electrical work) than to send money to such "stewards" in the hopes they'll use it either prudently or piously.