15Peaceful picketing
It shall be lawful for one or more persons in contemplation or furtherance of a trade dispute to attend at or near—
(a)a place where another person works or carries on business; or
(b)any other place where another person happens to be, not being a place where he resides,
for the purpose only of peacefully obtaining or communicating information, or peacefully persuading any person to work or abstain from working.