Two things:

1. Another reason I would buy a house with a HOA over my dead body.

2. If they didn't send those letters to every resident with a bumper sticker on their car than thats selective rule enforecment or whatever you want to call it. I would sue them, sounds like a perfect case for the ACLU.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200