Anti-Masonry is defined as "avowed opposition to Freemasonry

Freemasonry

Freemasonry is a fraternal organisation that arose from obscure origins in the late 16th to early 17th century. Freemasonry now exists in various forms all over the world, with a membership estimated at around six million, including approximately 150,000 under the jurisdictions of the Grand Lodge...

". However, there is no homogeneous anti-Masonic movement. Anti-Masonry consists of radically differing criticisms from sometimes incompatible groups who are hostile to Freemasonry in some form.
The earliest anti-Masonic document was a leaflet printed in 1698 by a Presbyterian minister named Winter. It reads:

TO ALL GODLY PEOPLE, In the Citie of London.

Having thought it needful to warn you of the Mischiefs and Evils practiced in the Sight of God by those called Freed Masons, I say take Care lest their Ceremonies and secret Swearings take hold of you; and be wary that none cause you to err from Godliness.