FOIA is the Freedom of information Act, which allows citizen oversight of government activity. It means you can request to see government records. This is so ubiquitous that all federal employees take yearly training about it. What this means is that DOGE knows they are committing crimes as they decimate the federal workforce and compromise its systems, and so they are now moving to exempt themselves from all FOIA requirements so no one can see what they are doing.
Meanwhile, Salesforce, who owns Slack, looking at transcripts: