Googling shows (alleged) cases on both ends of the political spectrum. For example, canceling protesters in Atlanta against the "Cop City" project; https://hellgatenyc.com/chase-bank-cancels-cop-city-proteste...

Palestinian aid groups do indeed seem to be getting debanked in the UK from time to time: https://www.theguardian.com/money/2005/jan/03/accounts.israe...