Tenant wouldn't let us cut dead trees

[Emily Wiu]

There are some leaning and standing huge dead trees on my property and I hired someone to cut them. I informed the tenants a week in advance, however they are making the process extremely difficult. They kept parking cars in the driveway knowing that we need the entire driveway to be completely clear of vehicles in order to get in the trunk removal vehicle. After we finally get the vehicle to position, they keep pulling their cars too close to the vehicle. They are also having a party with tons of kids on the tree removal days, and would not keep their kids away from the dropping branches. Now they don't want the arborist to continue cutting, even though I told them the trees could fall and injured even kill someone. Does anyone have any advice dealing with this issue?