Here’s one I learned from a past manager:

Stress that everyone needs to pitch in and make themselves useful at all times, but do not share any information at all

Make sure the work is not broken down into clear tasks. Make sure nobody else has access to the stakeholders. Make people ask separately for every single account or access credential they need, and respond with incredulity that they don’t already have it.

Give the impression that there are no processes. When someone submits work, criticise them for not following the process.

Each day, schedule meetings so you are impossible to contact until the early afternoon. That way you can interrupt any request for information by asking the person what work they did in the morning. The goal is to close the loop by making people scared to talk to you, so they blame themselves for not knowing anything.