Pro and anti-casino groups are launching their campaign operations this week as voters will decide in November whether to repeal the state's casino law.

The Committee to Protect Massachusetts Jobs, a recently-formed political group funded by gambling giants MGM Resorts International, Mohegan Sun and Penn National Gaming, said Monday they've been planning their campaign for the past three weeks and expect to launch "an extensive ground effort throughout the fall."

Meanwhile, Repeal the Casino Deal says it launched canvassing and field operations this past weekend.

Some 25 to 50 volunteers were expected to canvass neighborhoods in five communities while others staffed phone banks from the campaign's Springfield and East Boston field offices.

Massachusetts lawmakers in 2011 authorized the licensing of up to three resort casinos and one slot parlor.