These kinds of government tactics violate our fundamental constitutional rights. They make it enormously difficult to sustain grass-roots organizing. They create an atmosphere of fear and distrust which undermines any effort to challenge official policy.
Similar measures were used in the 1960s as part of a secret FBI program known as "COINTELPRO." COINTELPRO was later exposed and officially ended. But the evidence shows that it actually persisted and that clandestine operations to discredit and disrupt opposition movements have become an institutional feature of national and local government in the US.
You need to study these case histories of how the FBI really operates and what it really does.
Because contrary to official FBI proclamations, they are still at it!