Purging of Data in IPFS

Hello, I am new to IPFS and have few very basic questions for Private IPFS Network:

  1. Whether it is possible to remove data completely from IPFS? Recently, I read about MFS but it does not removes data completely from IPFS network. Is there any other option?
  2. Can we control access to data i.e. If particular node is not trusted to share data, Can we block access of data to that node. Does IPFS support blacklisting of nodes?
  3. If data is found malicious, How can we handle such situation.? Can we block access to this data to all nodes or remove data?