NEVER talk to these people.

When the FBI shows up "Do you have a warrant?" When they say NO, say "I don't answer any questions. I have nothing to say" and then go back in inside and CLOSE the door. Do not engage them any further. They'll probably leave at this point.

If they continue to loiter around your yard, call the local cops and tell them people claiming to be the FBI are in my front yard. They are trespassing and I want them removed from my property. VERY IMPORTANT HERE. Only talk with the local cop. If the FBI comes up to you and the officer while you are talking with the officer make it clear you will only talk with the officer and this is a private conversation that does not include this person. Talk about the FBI as a 3rd person. Do not look at them directly nor acknowledge them in any way and only continue to talk with the officer. Make it clear you will not do any more talking while the these people are within ear shot and repeat over and over you want them gone or you will file charges. If the feds ask questions while talking to the officer, ignore them. If they keeping talking to where they are talking over the officer tell the officer you cannot hear him because these trespassers are making too much noise (not talking).

At some point the officer will start to get tired of the situation pretty quickly. The feds will leave when they realize this.

The officer will probably talk to them to verify who they are before coming to your door. Doesn't matter. Never acknowledge them again and the repeat above.

Yeah I can. It's a daily thing now.